Fold (geology)

Imagine you take a really long piece of Play-Doh and squish it between your hands. The Play-Doh will get all bent and crumpled up, right? That's kind of what happens to rock layers in the Earth's crust.

Instead of Play-Doh, the Earth's crust is made up of different types of rock that can bend and twist. This bending is called folding. It happens when a lot of pressure is put on the Earth's crust, like from tectonic plates moving against each other.

When rocks fold, they can make cool shapes like waves or zig-zags. And if you look really closely at the different layers of rock in a fold, you can see how they bend and curve around each other. This can help scientists figure out how the Earth's crust has changed over time.