History of Earth
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50 free History of Earth trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Earth's story runs from a ball of molten rock to a living world, and almost all of it happened before anyone was around to watch. Continents have joined and split, seas have come and gone, and life has been pushed to the brink more than once. The clues are still here, in rock layers, fossils and the shapes of the continents themselves. This quiz follows that timeline from the beginning. It covers how the planet and its Moon formed, the first signs of life, the drifting of continents, the rise and fall of the dinosaurs, the ice ages and the arrival of our own species. It also asks about the tools and the people that made the story readable, from fossil hunters to the pioneers of radioactive dating. The questions suit an earth science class reviewing for a test as well as anyone curious about deep time. They start easy and get harder, and every answer comes with a short explanation, so you learn something even when you miss.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which group of living animals descends from theropod dinosaurs, making its members the only dinosaurs alive today?
Birds
Birds evolved from small theropods, the two-legged group that also produced Tyrannosaurus rex. Their closest living relatives are the crocodilians.
Q 02About how old is Earth, an age roughly one-third that of the universe itself?
4.5 billion years
4.5 billion years ago the planet was largely built within 10 to 20 million years, a quick start to a very long story.
Q 03Which crater, found by geophysicists prospecting for oil, marks the asteroid strike that doomed the dinosaurs?
Chicxulub
Chicxulub lies under about a kilometre of younger rock on Mexico's Yucatán Peninsula, which is why it stayed hidden. The asteroid that blasted it out was roughly ten kilometres wide.
Q 04Which supercontinent held nearly all of Earth's land before it began to break apart during the Mesozoic Era?
Pangaea
Pangaea was surrounded by a single superocean, Panthalassa. Its name comes from Greek words for 'all' and 'Mother Earth'.
Q 05Which gas, toxic to much early life, did cyanobacteria release into Earth's air as a by-product of photosynthesis?
Oxygen
Oxygen began building up in the air about 2,400 million years ago, a turning point known as the Great Oxidation Event. The gas may have killed off many microbes that had evolved without it.
Q 06Which landmass split from Madagascar, drifted north at about 20 cm a year and collided with Asia?
India
India is still pushing north-east at about 5 cm a year. Its slow-motion crash crumpled the crust into the Himalayas and the Tibetan Plateau.
Q 07Which fish, thought to have died out with the dinosaurs 66 million years ago, was caught alive in 1938?
Coelacanth
Coelacanth fossils go back more than 410 million years, which made the live catch a celebrated 'living fossil'. A museum curator, Marjorie Courtenay-Latimer, spotted it in a fisherman's haul.
Q 08Which rock, laid down on a seabed in the Ordovician Period, forms the very summit of Mount Everest?
Limestone
Limestone near the summit still holds fragments of sea creatures such as crinoids. The rock formed under water long before the Himalayas began to rise.
Q 09Which Ice Age animal survived in the Arctic until about 4,000 years ago, long after Egypt's Great Pyramid was built?
Woolly mammoth
The woolly mammoth had vanished from most of its range by about 10,000 years ago but hung on at Wrangel Island, off Russia's Arctic coast. The island herd died out around 2000 BCE.
Q 10Which sea mammals, whose early forms kept hind legs and toes, give Egypt's fossil valley Wadi Al-Hitan its name?
Whales
Whales lie fossilised by the hundred at Wadi Al-Hitan, a UNESCO World Heritage Site since 2005. The skeletons record the animals' shift from life on land to life in the ocean.
Q 11Which Mars-sized body, named after a Titan of Greek myth, is thought to have struck the young Earth and formed the Moon?
Theia
Theia takes its name from the mother of Selene, the Greek goddess of the Moon. Debris thrown out by the collision is thought to have gathered in orbit to build the Moon.
Q 12By what nickname is the Permian–Triassic extinction, the most severe in Earth's history, colloquially known?
The Great Dying
The Great Dying wiped out most marine species and about 70% of land vertebrate species. Animal life on land took some 30 million years to recover fully.
Q 13Which nickname describes the Cryogenian deep freezes, when ice sheets may have spread all the way to the equator?
Snowball Earth
Q 21Which layered mounds, built up by mats of microbes in shallow water, still grow at Shark Bay in Australia?
Stromatolites
Stromatolites peaked about 1,250 million years ago and then declined, which makes the living mounds of Hamelin Pool a window on a far older world.
Q 22Which mineral, found as tiny crystals in Western Australia's Jack Hills, is the oldest known material formed on Earth?
Zircon
Zircon crystals from the Jack Hills formed about 4,404 million years ago. Their chemistry suggests the young planet already had continental-type crust and liquid water.
Q 23Which structures in animal cells carry their own bacteria-like DNA, a relic of microbes that merged with larger cells?
Mitochondria
Snowball Earth was coined by Joseph Kirschvink in 1992. Some researchers prefer a 'slushball', with a band of open water left around the equator.
Q 14Which sea dried out almost completely about 5.6 million years ago, leaving a dry basin up to 5 km below sea level?
The Mediterranean
The Mediterranean refilled about 5.33 million years ago, when the Strait of Gibraltar reopened and the ocean poured back in. Geologists call that deluge the Zanclean flood.
Q 15Which eon, when the newborn Earth's surface is thought to have been molten lava, opens the geologic time scale?
Hadean
The Hadean is named after Hades, the Greek god of the underworld, for its hellish conditions. American geologist Preston Cloud coined the term.
Q 16Which era, covering the 66 million years since the dinosaurs died out, is nicknamed the Age of Mammals?
Cenozoic
Cenozoic means 'new life', and it is the era still under way. Mammals spread from a few small, simple forms into land, sea and flying animals of every size.
Q 17Which epoch, which began about 11,700 years ago, takes in all of written human history?
Holocene
The Holocene is often called the Age of Humans. It began as the last glacial period ended, and farming, cities and writing all followed.
Q 18Which period began about 539 million years ago with an 'explosion' of new animal groups in the fossil record?
Cambrian
The Cambrian explosion lasted between 13 and 25 million years. Charles Darwin counted the sudden appearance of animal fossils among the main difficulties for his theory.
Q 19Which period, known as the Age of Fishes, also saw the first forests spread across the land?
Devonian
The Devonian is named after Devon in south-west England, where its rocks were first studied. Jawed fish became so varied during it that the nickname stuck.
Q 20Which period, when giant sauropods were the dominant plant-eaters, is named after mountains on the French–Swiss border?
Jurassic
The Jurassic takes its name from the Jura Mountains, where its rock layers were first identified. Some of its sauropods were the largest animals ever to live on land.
Mitochondria are the 'powerhouses of the cell', and the ancient merger that created them led to every animal, plant and fungus alive.
Q 24Which 375-million-year-old fish, found on Ellesmere Island in 2004, had a neck and fins it could prop itself up on?
Tiktaalik
Tiktaalik is an Inuktitut word meaning 'large freshwater fish', suggested by Inuit elders of Nunavut. It is the earliest known fish with a neck, a step towards four-legged life on land.
Q 25Which extinct sea creatures, with over 22,000 described species, lived in the oceans for almost 270 million years?
Trilobites
Trilobites were among the earliest arthropods and among the most successful of all early animals. Only a handful of species remained when the end-Permian extinction finished them off.
Q 26Which fuel formed from the vast swamp forests that covered the land during the Carboniferous Period?
Coal
Coal gave the Carboniferous its name, which means 'coal-bearing' in Latin. The seams mined today are the buried remains of forests and swamps from about 300 million years ago.
Q 27Which volcanic province erupted for roughly two million years and is blamed for the worst mass extinction on record?
Siberian Traps
The Siberian Traps rank among the largest volcanic events of the last 500 million years. Their eruptions straddled the Permian–Triassic boundary about 252 million years ago.
Q 28Which rare metal, found worldwide in clay 66 million years old, led the Alvarez team to propose an asteroid strike?
Iridium
Iridium is one of the rarest elements in Earth's crust but far more plentiful in rocks from space. The 1980 find showed levels hundreds of times higher than normal.
Q 29On which continent have the earliest known Homo sapiens fossils, dated to about 315,000 years ago, been found?
Africa
Africa yielded the fossils at Jebel Irhoud in Morocco, a find that pushed the known age of our species back by more than 100,000 years.
Q 30Which 3.2-million-year-old skeleton, found in Ethiopia in 1974, showed that upright walking came before bigger brains?
Lucy
Lucy was named after a Beatles song that played over and over in the expedition camp. The skeleton pairs a small, ape-like skull with signs of an upright, two-legged walk.