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The ground moves as fast as your fingernails grow. What does that do in a million years?
Plate Tectonics lab · Last updated: 16 October 2026
You watch the ground move about as fast as your fingernails grow, then speed time up to see what a million years of creeping does. Oceans widen, continents collide and mountains rise. Plate tectonics explains earthquakes, volcanoes and the Himalaya, and it shows how slow changes add up to enormous ones.
What you'll discover
- Earth's outer shell is broken into large plates that move a few centimetres a year.
- Over a million years, a few centimetres a year adds up to tens of kilometres.
- Where plates pull apart, new ocean floor forms, and where they push together, mountains rise and earthquakes strike.
The science in plain words
Earth's rigid outer layer, the lithosphere, is split into about a dozen large plates and many smaller ones. They rest on hotter, softer rock in the mantle below, which can flow very slowly. Heat from deep inside the Earth keeps this rock moving, and the plates move with it, typically a few centimetres a year, about as fast as fingernails grow.
That sounds tiny, but time makes it huge. At 3 centimetres a year, a plate moves 30 kilometres in a million years and 3,000 kilometres in a hundred million years. The Atlantic Ocean was once closed, and it has widened slowly ever since the Americas split from Europe and Africa, a process that is still going on.
What happens depends on how plates meet. Where they move apart, as along the middle of the Atlantic, molten rock rises and makes new sea floor. Where they push together, one plate may sink beneath the other, building chains of volcanoes, or both may crumple upwards into mountains. The Himalaya formed as the Indian plate pushed into Asia, and the mountains are still rising. Where plates slide past each other, as along the San Andreas Fault in California, stress builds up and is released in earthquakes.
Where it fits
- India, NCERT: Plate tectonics is not part of the NCERT science syllabus for classes 6 to 10; it is taught in NCERT geography.
- United States: Grades 6 to 12
- Next Generation Science Standards: MS-ESS2-3, HS-ESS1-5
Common questions
How fast do tectonic plates move?
Most plates move a few centimetres a year, about as fast as fingernails grow. Some are slower and a few are faster. It is too slow to feel, but satellite measurements track the movement precisely, and over millions of years it reshapes continents and oceans.
How were the Himalayas formed?
The Himalaya formed when the Indian plate, moving north, collided with the Eurasian plate about 50 million years ago. Neither plate sank easily, so the crust crumpled and was pushed upwards. India is still pushing north, so the mountains are still slowly rising.
What is Pangaea?
Pangaea was a supercontinent that joined almost all of Earth's land together roughly 300 to 200 million years ago. As plates moved, it broke apart and the pieces drifted into today's continents. The matching coastlines of South America and Africa are a clue to this.
Related labs
- Earthquake Waves: Two kinds of wave race through the Earth. How do they tell us where a quake was, and what is inside?
- Volcanic Eruption: Why do some volcanoes pour out rivers of lava, and others explode?
- Rock Cycle: Follow a grain of rock: worn away, buried, cooked, melted and born again.
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Try it yourself
The Plate Tectonics lab is one of the interactive 3D science labs inside Taz. Change one thing, predict what will happen, then run it and watch. Labs open after you sign in.