Why do tectonic plates move?

• magnetic fields from Earth's liquid outer core
• convection in the mantle
• the rotation of the Earth

Which type of plate boundary produces new crust?

• a divergent boundary
• a transform boundary
• a convergent boundary

Transform plate boundaries occur where tectonic plates

• move away from each other
• move toward each other
• move sideways past each other

Divergent plate boundaries occur where tectonic plates

• move away from each other
• move toward each other
• move sideways past each other

Convergent plate boundaries occur where tectonic plates

• move toward each other
• move away from each other
• move sideways past each other

What is subduction?

• when the lithosphere is pushed upward, forming a mountain range
• when the lithosphere is pushed downward, toward the mantle
• it is another name for sea-floor spreading

What kind of crust is subducted?

• ocean crust, because it is LESS dense than continental crust
• continental crust, because it is LESS dense than ocean crust
• ocean crust, because it is MORE dense than continental crust

The youngest (newest) material on the ocean floor is found

• at subduction zones.
• at mid-ocean ridges
• under Antarctica

Earth’s tectonic plates (the lithosphere) are made up of

• Earth's ocean crust.
• the outer core and upper part of the mantle.
• the upper mantle and the crust.

When ocean crust is subducted toward the mantle, it will produce

• new crust.
• magma.
• mountains.