50 free Plate Tectonics trivia questions with answers — science & nature quiz, new questions added Aug 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 50 questions with answers and explanations. Play the quiz
Q 01Plate tectonics describes the movement of pieces of which layer of the Earth?
The lithosphere
This rigid outer shell, crust plus upper mantle, rides on the hotter, more ductile asthenosphere beneath.
Q 02How many 'major' tectonic plates are usually counted?
Seven or eight
The Indo-Australian plate is sometimes split in two, which is why the count wobbles.
Q 03What are the three types of plate boundary?
Convergent, divergent and transform
Where two plates meet decides whether crust is destroyed, created or simply slides past.
Q 04Plates typically move at speeds up to roughly how much per year?
About 10 cm
The Mid-Atlantic Ridge spreads at fingernail-growth pace; the Nazca plate races along at hair-growth pace, about 160 mm a year.
Q 05What is the process called in which one plate is carried down beneath another into the mantle?
Subduction
It shrinks Earth's surface, which is balanced by new crust forming at spreading ridges, a tectonic 'conveyor belt'.
Q 06Which is the only planet known to have active plate tectonics?
Earth
Some moons and neighbouring planets show signs of past or icy tectonic activity, but nothing like Earth's.
Q 07Which of Jupiter's moons shows signs of ice crustal plates moving and interacting?
Europa
Its icy shell behaves in some ways like Earth's rocky plates.
Q 08Which meteorologist proposed continental drift in 1912?
Alfred Wegener
He expanded the idea in his 1915 book The Origin of Continents and Oceans, but died in 1930 before being vindicated.
Q 09Why was Wegener's continental drift not widely accepted for decades?
He could not explain a physical mechanism for it
Critics like Harold Jeffreys could not see how continental rock could plough through the denser oceanic crust.
Q 10What name is given to the single landmass Wegener argued the present continents once formed?
Pangaea
Wegener likened the continents to icebergs of light sial floating on a sea of denser sima.
Q 11Which mammal-like reptile found across now-separate southern continents showed they were once joined?
Lystrosaurus
The fossil plants Glossopteris and Gangamopteris told the same story across the southern continents.
Q 12Which South African geologist's 1937 book Our Wandering Continents went beyond Wegener on Gondwana?
Alex du Toit
Field geologists in the southern hemisphere found the evidence for joined continents far more obvious than northern critics did.
Q 13Which English geologist proposed in 1928 that convection currents in the mantle might drive the plates?
Arthur Holmes
He had suggested in 1920 that plate junctions might lie beneath the sea, but such ideas were long ignored.
Q 21'Bullard's Fit', shown at the Royal Society in 1965, was a computer calculation of what?
How the continents around the Atlantic fit together
The 1965 Royal Society symposium is regarded as the official start of the theory's acceptance.
Q 22In 1967, W. Jason Morgan proposed that Earth's surface consists of how many rigid plates?
12
Two months later Xavier Le Pichon published a six-plate model that marked the theory's final acceptance.
Q 23What was the theory initially called when it was first accepted in the mid-1960s?
New Global Tectonics
Q 14Who coined the term 'seafloor spreading'?
Robert S. Dietz
Priority for the idea belongs to Harry Hess, who circulated an unpublished manuscript in 1960.
Q 15Harry Hess, the Princeton geologist behind seafloor spreading, held what rank in the Naval Reserve?
Rear Admiral
He concluded the Atlantic was expanding while the Pacific was shrinking.
Q 16Bruce Heezen's 1960 paper describing a worldwide rift system was based on his work with which cartographer?
Marie Tharp
Heezen at first backed Warren Carey's 'expanding Earth' idea to explain where all the new crust went.
Q 17What did magnetometers reveal about the ocean floor in the 1950s and 60s?
A zebra-like pattern of magnetic stripes
Alternating bands of normal and reversed polarity, symmetrical about the ridges, recorded Earth's field reversals as new crust formed.
Q 18The 1963 hypothesis linking magnetic stripes to seafloor spreading is named after which three scientists?
Vine, Matthews and Morley
Lawrence Morley reached the idea independently of Fred Vine and Drummond Matthews.
Q 19Which magnetic mineral in seafloor basalt makes the magnetic striping possible?
Magnetite
Icelandic mariners had noticed the rock distorting compasses as early as the late 18th century.
Q 20Who added the third class of fault, where plates grind past one another, to the model in 1965?
Tuzo Wilson
His 1966 paper also introduced what became known as the Wilson Cycle of ocean opening and closing.
The 50-year debate that ended in acceptance is now called the Plate Tectonics Revolution.
Q 24Which force is most widely thought to be the greatest driver of plate motion?
Slab pull
Cold, dense plates sinking into the mantle at trenches drag the rest along; 'ridge push' is really gravitational sliding.
Q 25The North American plate poses a puzzle for the sinking-slab theory of plate motion. Why?
It is moving but is nowhere being subducted
The African, Eurasian and Antarctic plates pose the same puzzle.
Q 26Which two continents' matching coastlines were noticed as early as 1596?
South America and Africa
Abraham Ortelius, Antonio Snider-Pellegrini and Eduard Suess all remarked on the fit before Wegener.
Q 27Old textbooks called oceanic crust 'sima' and continental crust 'sial'. What do the terms stand for?
Silicon-magnesium and silicon-aluminium
Oceanic crust is denser because it has less silicon and more heavy elements, so it sits below sea level.
Q 28Roughly how thick is the rigid outer shell under the continents, versus 100 km under oceans?
About 200 km
It varies a lot between basins, mountain ranges and the stable cratonic cores of continents.
Q 29What are ophiolites?
Pieces of oceanic crust pushed up and preserved on continents
They failed to be subducted and now mark the sites of vanished oceans within existing plates.
Q 30The Mid-Atlantic Ridge is an example of which boundary type?
Divergent
Ocean-to-ocean rifting there creates new ocean basin, small volcanoes and shallow earthquakes.