99 Fun Facts About Nature

Which is the largest ocean on Earth by surface area and volume?

The Pacific Ocean is the largest, at about 165 million square kilometres, more than all of Earth's land area combined.

What is the biological process by which plants convert light energy into chemical energy?

Photosynthesis is the process green plants, algae, and some bacteria use to transform light energy into chemical energy, typically in the form of sugars, while releasing oxygen as a byproduct.

Which lizard family famously shifts skin colour, mostly to signal to its own species?

Chameleons change colour mainly as social signals and in response to temperature; camouflage is only part of it, and some species show full reds, yellows, greens and blues.

What is the most abundant gas in Earth's atmosphere?

Nitrogen makes up 78.08 percent of dry air, with oxygen at 20.95, argon at 0.93 and carbon dioxide at just 0.04 percent. We breathe it in and out without using it.

Which desert is considered the largest hot desert in the world?

The Sahara in North Africa is the world's largest hot desert, covering about 9,200,000 square kilometres (3,600,000 sq mi). It is only the third-largest desert overall, behind the polar deserts of Antarctica and the Arctic.

What is the highest mountain in Africa?

Mount Kilimanjaro, a dormant volcano in Tanzania, stands as the highest mountain in Africa, with its summit reaching 5,895 meters above sea level.

What is the deepest known point in Earth's oceans?

The Challenger Deep, located within the Mariana Trench in the western Pacific Ocean, is the deepest known point in Earth's oceans, plunging to approximately 10,994 meters.

What is the largest living reptile?

The saltwater crocodile is the largest living reptile; males can exceed 6 metres, and it ranges from eastern India to northern Australia, taking prey up to and including sharks.

What is the scientific study of fungi called?

Mycology is the branch of biology dedicated to the study of fungi, including mushrooms, molds, and yeasts, examining their taxonomy, genetics, and biochemical properties.

What is the protective outer layer of a tree trunk called?

The bark is the outermost layer of a tree's trunk, branches, and roots, serving as a protective barrier against disease, insects, and environmental stressors like temperature changes.

What is the largest living species of fish?

The biggest fish in the sea eats some of the smallest things in it. The whale shark is a slow-moving, filter-feeding carpet shark that strains plankton and is harmless to swimmers.

What gas do plants absorb from the atmosphere during photosynthesis?

Plants use carbon dioxide, water, and sunlight to create glucose for energy and release oxygen as a byproduct.

Which type of plate boundary has two tectonic plates sliding past each other horizontally?

At a transform boundary the plates slide past each other horizontally. Most offset mid-ocean ridge segments on the sea floor; the San Andreas and North Anatolian faults are rare examples on land.

Which biome has permafrost and low-growing vegetation like mosses and lichens?

Tundra now gives off greenhouse gases itself, because its thawing frozen soil releases ancient carbon. It comes in three kinds, Arctic, Alpine and Antarctic, where cold and short seasons stop trees growing.

Which type of cloud is typically thin, wispy, and found at high altitudes?

Cirrus clouds are composed of ice crystals and often indicate fair weather, but can also signal a change in weather is approaching.

In which layer of Earth's atmosphere is most of the ozone layer found?

The ozone layer lies in the stratosphere, roughly 15 to 35 kilometres up, where it absorbs most of the Sun's ultraviolet-B radiation.

Which of these plant structures is primarily responsible for transpiration?

A plant breathes and sweats through the same holes. Stomata are tiny pores, typically on the underside of leaves, that control gas exchange and let water vapour escape as transpiration.

To which phylum do starfish and sea urchins belong?

Echinodermata are marine animals characterized by radial symmetry, a water vascular system, and often a spiny skin.

Which mineral sits at 1, the very bottom of the Mohs hardness scale, soft enough to scratch with a fingernail?

Ground up, the softest mineral on the Mohs scale is the talc in talcum powder. Talc defines hardness 1 and can be scratched with a fingernail.

What phenomenon is primarily responsible for the seasons?

The tilt is about 23.4 degrees, which is why the overhead Sun swings between the Tropic of Cancer and the Tropic of Capricorn; distance from the Sun has little to do with it — Earth is actually closest in early January.

Which of the three main rock types forms when molten magma or lava cools and solidifies, as granite and basalt do?

The name comes from the Latin for fire. Igneous rock forms when molten rock cools and solidifies: magma underground gives granite, lava at the surface gives basalt.

Which type of symbiosis leaves both species better off?

Mutualism benefits both partners. Bees and flowers are the classic case: the bee gets nectar and pollen, the plant gets pollinated.

What is the scientific study of plants called?

Botany is the branch of biology dedicated to the scientific study of plants, including their structure, growth, reproduction, and interactions with the environment.

What is the scientific study of animals called?

Zoology is the scientific discipline focused on the study of animals, covering their structure, embryology, classification, habits, and distribution.

What term describes organisms such as plants that make their own food from inorganic sources, forming the base of food webs?

Not every autotroph needs sunlight: some deep-sea bacteria make food from the chemical energy of vents. Autotrophs turn inorganic energy into organic compounds, which feed everything else.

Which bird can mimic chainsaws, camera shutters and car alarms?

The lyrebird, one of the world's largest songbirds, copies chainsaws, camera shutters and car alarms; the male pairs the impressions with a huge fanned tail in courtship.

Which Siberian rift lake is the world's deepest at 1,642 metres and holds about a fifth of Earth's fresh surface water?

Lake Baikal holds more fresh water than all five Great Lakes combined, around 22 percent of the world's fresh surface water. The Siberian rift lake plunges 1,642 metres.

What is the hardest known natural mineral?

It has the greatest number of atoms per unit volume of any known substance, which is why it is both the hardest and the least compressible; only another diamond will reliably scratch it.

Which layer of Earth's atmosphere is closest to the surface and where most weather occurs?

The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to about 12 km, and is where nearly all weather phenomena take place.

Which carnivorous plant, native only to the wetlands of the Carolinas, snaps its leaves shut on insects to digest them?

Wild Venus flytraps grow nowhere on Earth but the wetlands of North and South Carolina. The trap snaps shut only when an insect touches the trigger hairs more than once.

What is the largest land animal by mass?

The African bush elephant is the heaviest land animal. The largest well-measured bull, shot in Angola in 1974, stood 3.96 metres at the shoulder and is estimated at 10.4 tonnes.

What scale is commonly used to measure the magnitude of an earthquake?

The Richter scale, devised by Charles Richter in 1935, rates earthquakes from the amplitude of seismic waves; seismologists largely replaced it with the moment magnitude scale for large quakes.

What natural disaster can be caused by an underwater earthquake?

Tsunamis are a series of ocean waves caused by large-scale disturbances of the seabed, most commonly from underwater earthquakes, volcanic eruptions, or landslides.

Which animal is famous for a long winter dormancy with reduced metabolic activity?

For years scientists argued bears were not 'true' hibernators because their body temperature drops only 3 to 5 °C, far less than rodents; the definition was later changed to focus on metabolic suppression instead.

Which tree species includes Methuselah, the oldest known non-clonal organism on Earth?

Great Basin bristlecones like Methuselah, at 4,857 years, are the oldest non-clonal organisms known; some are estimated at over 5,000 years.

Which rock type forms when layers of sand, mud and shell fragments are buried and cemented together, often trapping fossils?

Fossils almost always turn up in sedimentary rock, because it forms gently at the surface. Sedimentary rocks are cemented from particles of mineral or organic debris deposited on Earth's surface.

What is the process called when water changes from a liquid to a gas?

Evaporation is a key component of the water cycle, where liquid water is transformed into water vapor and rises into the atmosphere.

Which continent has the highest average elevation?

Antarctica has the highest average elevation of any continent, about 2,500 metres, because its ice sheet lifts the mean; it is also the coldest, driest and windiest continent.

Which bird, a Cuban species weighing under two grams, is the smallest living bird on Earth?

The bee hummingbird weighs less than a US penny: males average under two grams and 5.5 centimetres long. It lives only in Cuba.

What is the longest river in South America?

The Amazon River is unmatched by volume: it discharges more water than any other river on the planet. Flowing mainly through Peru and Brazil, it is South America's longest and, by some measurements, the world's.

Which are the only mammals capable of sustained, powered flight?

The others merely glide; vampire bats are also the only mammals known to sense infrared, using heat sensors around the nose to find blood vessels.

Which living animal is the largest known to have ever existed?

The blue whale is the largest animal known to have existed: confirmed individuals reach about 30 metres and up to 190 tonnes, heavier than any dinosaur.

What term describes the variety of life found on Earth or in one particular region?

Biodiversity encompasses the diversity of genes, species, and ecosystems, and is crucial for the health and stability of natural systems.

What sits at the base of most marine food webs as the primary producer?

Phytoplankton, microscopic photosynthesising algae and cyanobacteria drifting near the surface, turn sunlight into the food that nearly every marine food web ultimately depends on.

What is the fastest land animal?

A cheetah is built like a sprinter: powerful hindlimb muscles, long limbs and a flexible spine. It is the fastest land animal, running at 93 to 104 km/h.

What instrument is used to measure wind speed?

An anemometer is a common weather instrument used to measure the velocity of wind, often featuring rotating cups.

Which type of forest is defined by broadleaf trees that drop their leaves every autumn, blazing with colour first?

Autumn colour is mostly unmasking: as chlorophyll breaks down, the carotene and xanthophyll pigments already in the leaf show through. Deciduous forests are dominated by broadleaf trees that shed every fall.

Which country on the Pacific Ring of Fire has around 130 volcanoes classified as active?

Indonesia has around 130 active volcanoes, more than any other country. It also holds Lake Toba in North Sumatra, the caldera left by a supereruption about 74,000 years ago, one of the largest known.

What is the process by which water vapor in the air changes into liquid water, forming clouds?

Condensation is a crucial part of the water cycle, where water vapor cools and transforms into tiny liquid droplets or ice crystals, forming clouds.

Which monitor lizard, the largest in the world, lives only on five Indonesian islands including Flores and Rinca?

Komodo dragons are found wild on just five islands: Komodo, Rinca, Flores, Gili Dasami and Gili Motang. The biggest population lives inside Komodo National Park.

Which seabird migrates farther than any other, travelling from the far north all the way to Antarctica?

The Arctic tern's pole-to-pole commute takes it past every ocean and near every continent.

What happens to an Alaskan wood frog's heart during the months it spends frozen?

The wood frog's heart stops beating entirely while it is frozen, and it does not breathe; up to two-thirds of its body water turns to ice, with glucose acting as antifreeze inside its cells.

Sequoia National Park's General Sherman holds which title?

General Sherman is neither the tallest tree nor the oldest, just the biggest. With an estimated 52,500 cubic feet of wood, it is the largest tree by volume, measured as a single stem.

Hyperion, the tallest known living tree on Earth, belongs to which species?

Hyperion is a coast redwood in California's Redwood National Park, measured at about 116 metres (over 380 feet), taller than the Statue of Liberty including its pedestal.

Pando, a 47,000-stem single organism in Utah's Fishlake National Forest, is a clone of which tree?

Every trunk is genetically the same male aspen, which is generally held to be the heaviest single organism alive.

How many true leaves does the Namib Desert plant Welwitschia grow in its entire lifetime?

The same pair of leaves keeps growing for the plant's whole life — hence its Afrikaans name meaning "two leaves, can't die".

The highest density of lightning anywhere on Earth crackles over a lake in which country?

Venezuela's Lake Maracaibo, home of the Catatumbo lightning, records roughly 250 flashes per square kilometre a year, the highest lightning density on Earth.

What moves the "sailing stones" that leave trails across Racetrack Playa in Death Valley?

Rafts of thin winter ice break up in the wind and shove the rocks along the wet playa floor — a puzzle only confirmed by a 2014 study.

Which desert is the driest non-polar desert in the world?

Parts of Chile's Atacama are so arid they double as Mars analogues for researchers. It is also the largest fog desert on Earth.

Roughly how far does the Great Barrier Reef stretch along Australia's coast?

The reef spans over 2,300 kilometres and takes in more than 2,900 individual reefs and 900 islands.

A mantis shrimp's club strikes so fast that it generates what in the water around it?

The strike is so fast it leaves vapour-filled cavitation bubbles in its wake; their collapse delivers a second hit almost as damaging as the punch itself.

How many hearts does an octopus have?

An octopus has three hearts, and two of them exist just for its gills. A systemic heart circulates blood around the body while two branchial hearts push it through the two gills.

Tardigrades are among the very few animals documented to have survived what?

Tardigrades survived exposure to open outer space on the 2007 FOTON-M3 mission; in their dried-out tun state they shrug off vacuum, radiation and temperatures from -272 °C to +149 °C.

The so-called immortal jellyfish cheats death by doing what after it reaches sexual maturity?

Turritopsis dohrnii can wind its own life cycle backwards to a sedentary, sexually immature polyp colony.

A honey bee's waggle dance, which tells hivemates where food is, traces which shape?

The dancer alternates waggle runs with left and right return loops, carving out a figure eight.

The bombardier beetle's defensive spray is heated to roughly what temperature before it fires?

A violently exothermic reaction between hydroquinone and hydrogen peroxide brings the fluid close to boiling, vaporising about a fifth of it.

Which emperor penguin parent incubates the pair's single egg while the other heads to sea to feed?

The male balances the egg on his feet for just over two months through the Antarctic winter — the only penguin species to breed in that season.

Which plant produces the largest single bloom in the world?

Rafflesia arnoldii, a parasite of Sumatran and Bornean rainforests, bears the largest single flower: up to a metre across and about 7 kilograms, with no leaves, roots or stem of its own.

Why do so-called corpse flowers reek of rotting meat?

Flies and beetles that feed on carrion are fooled into visiting, and carry pollen away with them.

What record does the titan arum, technically a cluster of many flowers, actually hold?

It is a cluster of many tiny flowers, and that cluster is the largest unbranched inflorescence of any flowering plant.

Auroras form when charged particles funnelled down Earth's magnetic field hit which gases?

Excited oxygen and nitrogen release their extra energy as light when they settle back down — much the way a neon lamp works.

What does the Enhanced Fujita Scale actually measure when it rates a tornado?

Surveyors rate the destruction and work backwards to estimate wind speed, which is why ratings are assigned after a tornado passes.

In which year did Dr. Ted Fujita first publish the original tornado intensity scale that bears his name?

Fujita laid out the six-category F-Scale in a 1971 research paper; the Enhanced version replaced it in 2007.

How far may eastern monarch butterflies fly in autumn to reach their overwintering sites?

Eastern monarchs may fly more than 2,000 miles, up to about 3,000, from Canada and the northern US to roost in Mexico's oyamel fir forests; western monarchs winter on the California coast instead.

How long ago did the asteroid impact that ended the Cretaceous period occur?

The Chicxulub impact 66 million years ago ended the Cretaceous and wiped out the non-avian dinosaurs; its roughly 150-kilometre crater lies buried under Mexico's Yucatan Peninsula.

Which moon of Saturn is the only world besides Earth known to have lakes on its surface?

Titan's lakes and seas, such as Kraken Mare, hold liquid methane and ethane at about -180 °C, and its surface is carved by river channels.

Approximately what share of Earth's surface is covered by ocean?

Ocean covers about 71 percent of Earth's surface, some 361 million square kilometres of continuous saline water.

Roughly four-fifths of all living biomass on Earth is made up of what?

Plant life, mostly trees, accounts for about 450 of the roughly 550 gigatonnes of carbon in Earth's biomass, around 80 percent; bacteria come second at about 13 percent.

The 'Snowball Earth' glaciation that preceded the Cambrian explosion occurred in which era?

The Snowball Earth glaciations fall in the Neoproterozoic era's Cryogenian period, roughly 720 to 635 million years ago, when ice reached the tropics before multicellular life diversified.

Which bird of prey, diving in a 'stoop' at over 320 km/h, is often called the fastest animal on Earth?

Suzuki named its Hayabusa superbike after this bird, using the Japanese word for peregrine falcon. In its hunting dive, the stoop, it can top 320 km/h, making it arguably the fastest animal alive.

Which animal has the largest brain on Earth, over five times heavier than a human's?

The sperm whale's brain weighs about 7.8 kilograms, over five times a human's; the same species carries spermaceti, the waxy oil in its huge head that whalers prized for candles and lamp fuel.

Which fish holds the record for the longest lifespan of any known vertebrate?

The Greenland shark is the longest-lived vertebrate known: one individual was estimated at 392 years old, give or take 120. The species grows only about a centimetre a year.

The shores of which body of water are the lowest land-based elevation on Earth?

The Dead Sea's shores lie about 435 metres below sea level, the lowest land on Earth; its surface has been falling by roughly a metre a year since the 1960s.

Which Arctic species may be the longest-lived mammal, reaching more than 200 years?

Bowhead whales can live more than 200 years; stone harpoon points from the 1800s have been found embedded in living animals, which first hinted at their extreme ages.

The aye-aye, a lemur that taps tree trunks with a thin middle finger, is native to where?

The aye-aye lives only in Madagascar. Its tapping is percussive foraging: it listens for hollows where grubs hide, then gnaws in with ever-growing incisors.

Where does a male platypus carry the spur that delivers its painful venom?

Both sexes are born with ankle spurs, but only males keep them into adulthood. The venom is not lethal to humans.

Why is a horseshoe crab's blood bright blue?

Horseshoe crab blood carries oxygen with copper-based haemocyanin, not iron, so it runs blue; it is harvested for the LAL test that detects bacterial toxins in vaccines, then the animals are returned to the sea.

Based on median lethal dose in mice, which snake is regarded as the world's most venomous?

The inland taipan of central Australia has the lowest recorded LD50 of any snake; a sea snake held the popular title for years because a 1996 Smithsonian book mixed up toxicity data from different testing methods.

Which flightless bird is the largest living species of bird?

The common ostrich is the largest living bird, with males up to 2.8 metres tall; its 50-millimetre eyes are the largest of any land vertebrate and its eggs the largest of any living bird.

Coral 'bleaches' white when stressed polyps expel or consume what?

Those zooxanthellae supply up to 90 percent of the coral's energy, so a bleached colony is not dead yet but is starving.

Roughly how hot does the air around a lightning flash get?

A lightning channel heats the air to about 30,000 °C, roughly five times the Sun's surface temperature; the sudden expansion of that superheated air is what we hear as thunder.

Which shorebird flies Alaska to New Zealand, the longest non-stop flight of any bird?

It is also the longest journey without pausing to feed by any animal, and the round trip for that subspecies exceeds 29,000 km.

How many neck vertebrae does a giraffe have, the standard mammalian limit?

Humans have the same count. The giraffe's neck comes from each vertebra being hugely elongated, not from adding extra bones.

Which seabird has the greatest known wingspan of any living bird?

The wandering albatross has the largest wingspan of any living bird, up to about 3.5 metres, letting it glide for hours over the Southern Ocean with barely a flap.

The saguaro cactus, which may take 75 to 100 years to grow an arm, is native to which desert?

The saguaro grows only in the Sonoran Desert of Arizona, Sonora and a sliver of California; some never grow arms at all, while one specimen was recorded with 78 of them.

Which is the world's largest freshwater body by surface area?

Lake Superior covers about 82,100 square kilometres, the largest freshwater surface on Earth; by volume it ranks only third, behind the far deeper Baikal and Tanganyika.

Why are captive-bred poison dart frogs not significantly toxic?

Wild frogs sequester alkaloids from ants, mites and centipedes; reared on fruit flies and crickets, they never build up the poison.

Despite its name, the electric eel is actually a type of what?

Electric eels are knifefish of the order Gymnotiformes, not true eels; the strongest species, Electrophorus voltai, can discharge up to 860 volts, the most powerful known bioelectricity in nature.

A 3.5-square-mile honey fungus, maybe Earth's largest organism, grows in which US state?

The 'humongous fungus', an Armillaria ostoyae, lives in Oregon's Malheur National Forest, mostly hidden underground as a web of black rhizomorphs spread across roughly 2,400 acres.