Did you know there are mountains, valleys and trenches down under the ocean? The ocean floor is a large part of Earth's crust, and most of it is...
Learn about the oceanic crust, including the oceanic crust definition, oceanic crust thickness and density, oceanic crust composition, and other...
Tectonic Plates Lesson for Kids: Definition, Theory & Facts from Chapter 9/ Lesson 1 44K Discover the pieces of the Earth's crust known as tectonic plates. Explore the layers of the Earth, how tectonic plates move by convection currents in the mantle, the Plate Tectonic theory, and the lan...