Plate Tectonic Theory

Which layer of the Earth has the highest temperature?

• Core

• Mantle

• Crust

The _____sphere is a solid rock layer made up of the crust and uppermost mantle. It is divided into tectonic plates.

The _______sphere is the semi-solid layer of flowing, molten rock in the mantle. It lies below the lithosphere.

Convection currents are movements of heat within the [ 1 ].

The heat is generated from the [ 2 ].

• [1] core, [2] mantle

• [1] mantle, [2] core

Convection currents drive the movement of plates. Rising convection currents drive the [ 1 ] plate boundary, while sinking convection currents drive the [ 2 ] plate boundary.

• [1] convergent, [2] divergent

• [1] divergent, [2] convergent

Another force that drives plate movement is slab-pull force.

At what type(s) of plate boundary does slab-pull force occur?

• Convergent only

• Divergent only

• Transform only

• All types of plate boundaries

Slab-pull force refers to _______ acting on the subducting plate, causing the plate to sink further into the mantle.

(Hint: starts with the letter 'g')

The less dense plate subducts under the denser plate.

• True

• False

One evidence to support the plate tectonic theory is seafloor _________.

At what type(s) of plate boundary does seafloor spreading occur?

• Convergent only

• Divergent only

• Transform only

• All types of plate boundaries