Inside the earth

By: Haley Kable

Plate Motion

Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth's mantle. This strong outer layer is called the lithosphere.

4 types of Plate Boundaries

Divergent- plates moving apart from each other

Convergent- plates moving toward each other

Subduction Zone- plates that are moving and collide

Transform- plates moving past each other and rubbing

Convection Currents

Convection is one of the three main types of heat transfer, the other two being conduction and radiation. Unlike the other two, convection can only happen in fluids -- liquids and gases. This is because the molecules have to be free to move.


The force that causes most of the plate movement is thermal convection, where hear from the Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the plates of the crust along with them.