8.2 Review

What are the main three types of boundaries between plates?

• Divergent, convergent, and transform
• Divergent, convergent, and subduction
• Convergent, transform, and collision
• Convergent, transform, and rift

What is a divergent boundary?

• A boundary between two plates that are moving towards each other
• A boundary between two plates that are moving apart
• A boundary between two plates that are sliding past each other
• A boundary between two plates that are colliding

Where do most divergent boundaries lie?

• Along the ocean floor
• Along mountain ranges
• Along continental shelves
• Along coastlines

What are rift valleys?

• Deep valleys at the center of a mid-ocean ridge
• Deep valleys formed by subduction boundaries
• Deep valleys formed by collision boundaries
• Deep valleys formed by transform boundaries

Which is part of the process of sea-floor spreading?

• Molten rock forces its way upward through rift valleys
• Molten rock cools and hardens into oceanic crust
• Older crust is pushed away from the ridge
• All of the above

What are fracture zones?

• Broken segments of rift valleys
• Deep valleys at the center of a mid-ocean ridge
• Places where two plates collide
• Segments of transform boundaries

What is a subduction boundary?

• A boundary between two plates that are moving towards each other
• A boundary between two plates that are moving apart
• A boundary between two plates that are sliding past each other
• A boundary between two plates where one plate is pushed under the other

What features are created by subduction boundaries?

• Deep-sea trenches and volcanic island arcs
• Rift valleys and fracture zones
• Mountain ranges and rift valleys
• Transform boundaries and collision boundaries

What is a collision boundary?

• The boundary formed when two plates collide and are welded together
• The boundary formed when two plates slide past each other
• The boundary formed when two plates move apart
• The boundary formed when two plates subduct under each other

What is a transform boundary?

• A boundary between two plates that are moving towards each other
• A boundary between two plates that are moving apart
• A boundary between two plates that are sliding past each other
• A boundary between two plates that are colliding