Plate Tectonics Trivia
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99 free Plate Tectonics trivia questions with answers — science & nature quiz, new questions added Oct 2026.
This plate tectonics trivia quiz covers the theory that explains earthquakes, volcanoes, mountain ranges and the slow wandering of continents. The easy questions handle the basics: what the plates are made of, the three kinds of boundary, how fast plates move, the supercontinent Pangaea and where most volcanoes are found. The harder end goes into the science and its history: Alfred Wegener's continental drift and why geologists laughed at it, Arthur Holmes and mantle convection, the zebra-stripe magnetism that proved seafloor spreading, Hess and Dietz, Tuzo Wilson's transform faults, Wadati-Benioff zones, slab pull versus ridge push, ophiolites, the supercontinents before Pangaea, and why Venus and Mars never developed plates of their own. Every answer was checked against the encyclopaedia entry before publishing and the supporting sentence is stored with each question. Our geology, earthquakes, volcanoes and natural disasters quizzes are the natural next stop.
30 of 99 questions with answers and explanations. Play the quiz
Q 01Plate tectonics describes the movement of pieces of which layer of the Earth?
The lithosphere
The lithosphere is the cool, rigid shell of crust plus uppermost mantle, and it is broken into plates. They can move only because the hot, semi-solid asthenosphere beneath them slowly flows.
Q 02Which sea is an ocean in the making, still widening as the plates on either side pull apart?
The Red Sea
The Red Sea. It fills the long, narrow gash that opened when the Arabian Peninsula was torn away from the continent beside it, as new sea floor began to spread between the two.
Q 03Which island country sits astride the Mid-Atlantic Ridge, so visitors can walk along the boundary between two plates?
Iceland
Iceland. Almost all of the ridge lies hidden deep under the ocean, but a hot spot beneath the island is thought to have piled up enough lava to lift this stretch above the waves.
Q 04Besides heat left from Earth's formation, what keeps its interior hot enough to drive plate tectonics?
Unstable atoms breaking down
Unstable atoms breaking down. Uranium, thorium and potassium scattered through the rock give off heat as they decay, an estimated half of all the heat that flows out of the planet.
Q 05The 2004 Indian Ocean tsunami began when a plate boundary ruptured off the coast of which Indonesian island?
Sumatra
Sumatra. Two plates had been stuck together offshore, storing up strain; when the boundary let go along more than 1,000 km, the seabed sprang up by several metres and shoved the ocean into a tsunami.
Q 06Geologists made the case in 2017 for which 'hidden continent', a landmass that lies 94% under the sea?
Zealandia
Zealandia. Its crust was stretched thin as it tore away from a supercontinent in the age of the dinosaurs, so most of it sank, leaving New Zealand and New Caledonia as the largest parts still above the waves.
Q 07Which of Jupiter's moons shows signs of ice crustal plates moving and interacting?
Europa
Europa. When scientists pieced old Galileo images back together like a jigsaw in 2014, nearly 20,000 square km of icy crust was missing, apparently forced down beneath a neighbouring plate.
Q 08Alfred Wegener, the father of continental drift, died in 1930 on a weather expedition to which icy island?
Greenland
Greenland. Wegener died on the ice cap a day or two after his fiftieth birthday, on his way back from carrying food to stranded colleagues, and never saw his theory accepted.
Q 09Why did most geologists reject Wegener's idea of continental drift for decades?
He had no convincing mechanism
He had no convincing mechanism. The forces Wegener suggested, centrifugal and tidal, were far too weak to push continents through the ocean floor.
Q 10What name is given to the single landmass that Alfred Wegener argued today's continents once formed?
Pangaea
Pangaea, from the Greek for 'all' and 'earth'. Wegener himself first called it the 'Urkontinent', German for primal continent, and the name Pangaea first appears in his book's 1920 edition.
Q 11In 1969 fossil hunters found Lystrosaurus, a land reptile already known from South Africa, on which other continent?
Antarctica
Antarctica: Lystrosaurus was no swimmer, so its bones in the Transantarctic Mountains meant the frozen continent had once been joined to Africa. A polar veteran called it one of the truly great fossil finds of all time.
Q 12Wegener noted that the Scottish Highlands line up with which North American mountain range once the Atlantic is closed up?
The Appalachians
The Appalachians. They and the Scottish Highlands are worn-down pieces of one great mountain chain, raised when ancient continents collided and later torn in two as the ocean opened between them.
Q 13Arthur Holmes proposed, decades before plate tectonics, that continents are carried along by what?
Q 21Which landmass was once an island far south of the Equator before drifting north to collide with Asia?
India
India. It crossed thousands of kilometres of ocean before striking Asia, and the collision is still going on: the mountain wall raised along the join is being pushed higher today.
Q 22A 2011 earthquake off which country is calculated to have shortened Earth's day by about 1.8 millionths of a second?
Japan
Japan. When the plate boundary off its north-east coast slipped, enough rock shifted, by NASA's calculations, to make the planet spin a touch faster, and to nudge the axis Earth's mass is balanced on by more than 10 cm.
Q 23Which force is most widely thought to be the greatest driver of plate motion?
Slab pull
Mantle convection currents
Mantle convection currents. Holmes pictured hot rock slowly circulating and carrying the continents along like a conveyor belt, and the idea later shaped the theory of seafloor spreading.
Q 14Geologist Harry Hess mapped the ocean floor with his ship's echo sounder between battles of which war, years before proposing seafloor spreading?
The Second World War
The Second World War: Hess captained a Navy transport and kept its echo sounder running from one island landing to the next. His profiles revealed flat-topped drowned volcanoes on the sea floor, which he named guyots.
Q 15In 1977 scientists diving on a volcanic ridge deep beneath the sea near the Galápagos Islands became the first to see what?
Hydrothermal vents
Hydrothermal vents. The geologists went looking for hot springs where new crust forms and, to their amazement, found them crowded with animals nobody had seen before, living without sunlight.
Q 16Which mapmaker found a great valley along the crest of the Atlantic's undersea mountains, which Bruce Heezen first dismissed as 'girl talk'?
Marie Tharp
Marie Tharp. Heezen groaned that her valley 'looks too much like continental drift', then came round when a map of undersea earthquakes lined up neatly inside it.
Q 17The magnetometers that first charted the seafloor's magnetism in the 1950s were adapted from wartime aircraft gear built to find what?
Submarines
Submarines. Detectors built to hunt them from the air were towed behind survey ships instead, where they picked up odd magnetic variations across the ocean floor that nobody had expected.
Q 18Vine, Matthews and Morley realised in 1963 that the seafloor's magnetic stripes are a recording of what?
Earth's magnetic field flipping
Earth's magnetic field flipping. New crust freezes in the direction of the field as it cools and then moves aside for the next batch, so the ocean floor works like a tape recording of every flip.
Q 19In 1963 Canadian geophysicist J. Tuzo Wilson explained which island chain as a plate drifting over a fixed 'hot spot'?
Hawaii
Hawaii. Wilson reasoned that each island was built over the same stationary plume of heat and then carried away, which is why the islands grow steadily older and more eroded toward the northwest.
Q 20Which continent drifts north about 7 cm a year, enough to leave its official map coordinates 1.5 metres out by 2016?
Australia
Australia. Global coordinates stay put while the ground moves, so the country's 1994 map grid slipped steadily out of step, and a new grid had to be drawn up with every point shifted north to catch up.
Slab pull. The cold, dense edge of a plate sinks under its own weight and drags the rest of the plate after it, while the push from the ridges is thought to add less.
Q 24Which technology lets geologists measure plates creeping a few centimetres a year?
GPS
GPS. Receivers fixed to the ground on different plates have their positions measured again and again, to within a fraction of a millimetre a year, so geologists can watch the two sides of a fault creep past each other.
Q 25Which two continents' matching coastlines were noticed as early as 1596?
South America and Africa
South America and Africa. The mapmaker Abraham Ortelius suggested in 1596 that the Americas had been torn away from the Old World by earthquakes and floods, three centuries before Wegener made the case.
Q 26What do 'sima' and 'sial', old textbook names for oceanic and continental crust, stand for?
Silicon-magnesium and silicon-aluminium
Silicon-magnesium and silicon-aluminium. The names were coined in German from the elements' first letters, and the difference matters: magnesium-rich ocean crust is the denser of the two, so it lies low enough for the sea to cover it.
Q 27Which US national park sits above a hot spot that has left a trail of older volcanic craters across Idaho?
Yellowstone
Yellowstone. The plume of heat stays put while North America slides south-west across it, so a 500-mile trail of old craters runs back through southern Idaho, with the park at the young end.
Q 28What do geologists call slabs of ancient ocean floor now found stranded high and dry on the continents?
Ophiolites
Ophiolites. Named from the Greek for snake, after their scaly green rock, they let geologists walk through a slice of deep ocean crust and the mantle beneath it without getting their feet wet.
Q 29The Mid-Atlantic Ridge is an example of which boundary type?
Divergent
Divergent. The plates move apart along the ridge and new crust wells up to fill the gap, at about 2.5 cm a year, which has been enough to widen the Atlantic from a narrow inlet into an ocean.
Q 30The San Andreas Fault in California is the classic example of which boundary type?
Transform
Transform. The two plates slide sideways past each other at about the rate fingernails grow, so Los Angeles, west of the fault, is slowly heading north and will one day sit beside San Francisco.