Think of the crust like the crispy, crunchy shell on a giant, molten burrito. The inside is hot, liquid rock called magma, and the crust keeps it all from spilling out. That’s a pretty big job for something that’s thinner than the skin of an apple compared to the planet’s size.
Under the oceans, the crust is only about 3 to 6 miles thick. Under mountains? It’s a chunky 30 miles. That’s like comparing a slice of cheese to a stack of pancakes!
It’s a Giant, Slow-Motion Raft
The crust isn’t one solid piece. It’s broken into massive puzzle pieces called tectonic plates. These plates are constantly, very slowly, drifting around like bumper cars at a county fair.
They move about as fast as your fingernails grow. So, don't worry about your house sliding into the ocean tonight. But over millions of years? They build entire mountain ranges and rip oceans apart. That’s some serious patience.
