Plate Tectonics

Rocky or rigid outer part of Earth consisting of the brittle crust and the top part of the upper mantle

• Lithosphere

• Oceanic Crust

• Continental Crust

• Asthenosphere

A satellite image can help scientist locate the area where two plates have diverged by showing the existence of

• Plateaus

• Mountains

• Rift Valleys

• Grassy Plains

Who is the scientist who proposed Continental Drift Theory?

• Albert Einstein
• Alfred Wegener
• Isaac Newton
• John Dalton

Most geologists think that the movement of Earth's tectonic plates is caused by

• the rotation of the Earth.

• the Earth's magnetic field.

• subduction.

• convection currents.

Associated with transform boundaries.

• Volcanoes
• mountains
• trenches
• earthquakes

A location where two tectonic plates collide is known as a _________ boundary.

• Convergent
• Divergent
• Transform
• Spreading

A divergent boundary occurs when plates ....

• Pull apart
• Come together
• Slide past each other
• subducting

Where does seafloor spreading take place?

• Convergent boundaries

• The continentals shelves

• Transform boundary

• Mid-ocean ridges

The movement of the tectonic plates is caused by

• the rotation of the Earth.

• convection currents in the Asthenosphere

• the gravity of the iron-nickel core.

• the Moho discontinuity.

Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that

• the oceanic crust is melting.

• the denser ceanic crust is subducting under the less dense oceanic crust

• volcanic islands are forming.

• the tectonic plates are moving away from each other.