E.8.9A.2_8.9A.3

What causes tectonic plates to move along the Earth's surface?

• wind
• ocean currents
• convection in the mantle
• expansion of the Earth

What type of boundary occurs when two plates move away from each other?

• transform
• subduction
• convergent
• divergent

What forms at a divergent boundary between two oceanic plates?

• rift valley
• mountain
• mid-ocean ridge
• trench

Which type of crust is more dense?

• oceanic
• continental
• divergent
• pizza

What type of boundary occurs when two plates move toward each other?

• convergent
• divergent
• transform
• lateral

What forms at a convergent boundary between a continental plate and an oceanic plate?

• volcanoes
• rift valleys
• faults
• mid-ocean ridges

A rift valley occurs at a ____________ boundary.

• divergent
• convergent
• transform
• horizontal

What is the process in which hot molten rock rises, then cools and sinks back to the core?

• plate tectonics
• continental drift
• convection
• divergence

A trench forms at a _________ boundary.

• convergent
• divergent
• transform
• vertical

Mountains form at a ___________ boundary.

• transform
• divergent
• convergent
• subduction