Plate Tectonics

A ______ is a section of the lithosphere that slowly moves over the asthenosphere, carrying large slabs of continental and oceanic crust.

• wedge
• plate
• chunk
• fault

A break in Earth's crust along which rocks move is called a ________.

• plate
• rift
• fault
• breach

What is the name of the single landmass that began to break apart 200 million years ago?

• Panthalassa
• Laurasia
• Gondwanna
• Pangaea

The process by which molten material adds new oceanic crust to the ocean floor is called ___________.

• Divergent boundary
• Sea-floor spreading
• Convergent boundary
• Renovating 

What is an undersea mountain chain where new ocean floor is produced?

• Rift valley
• Deep-ocean trench
• Mid-ocean ridge
• Transform bounda

A __________ is a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.

• deep-ocean trench
• rift valley
• sea-floor spreading
• mid-ocean ridge

What is the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary?

• Subduction
• Induction
• Abduction 
• Reduction

_____________ is a plate boundary where two plates move away from each other.

• Convergent boundary
• Transform boundary
• Divergent boundary
• Insurgent boundary

_____________ is when two plates move toward each other.

• Convergent boundary
• Allegiant boundary
• Transform boundary
• Sliding boundary

A _____________ is when two plates move past each other in opposite directions.

• emergent boundary
• divergent boundary
• transform boundary
• convergent boundary