What do we call a mountain chain on the ocean floor?

• seafloor spreading

• mid ocean ridge

• tectonic plate

• subduction

Warm, less dense magma __________ in the mantle.

• rises

• sink

What is the name of the fossil found on both sides of the South Atlantic Ocean?

• Glossopteris

• Lystrosaurus

• Mesosaurus

• Tyrannosaurus Rex

What do we call it when magnetic north changes places with magnetic south?

• magnetic reversals

• seafloor spreading

• magnetic minerals

• magnetosphere

Which layer does convections occur?

• lithosphere

• inner core

• outer core

• mesosphere

What was the name of the supercontinents in the theory of continental drift?

• Gondwana

• Laurasia

• Pangaea

• Panthalassa

Why was Wegener's theory not accepted when he proposed it?

• He could not explain how and why the continents moved.

• He could not explain how the Mesosaurus got on Africa

• He was not a geologist.

• He could not explain coal beds in Antarctica.

What is the Glossopteris?

• a land mammal

• a tree fern

• a swimming reptile

• a continent

Which mechanism for plate movement is the most important?

• convection

• ridge push

• slab pull

• seafloor spreading

Cooler, more dense magma ________ in the mantle.

• rises

• sinks