Plate Tectonics

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

A rift valley occurs at a ____________ boundary.

• divergent
• convergent
• transform
• horizontal

A trench forms at a _________ boundary.

• convergent
• divergent
• transform
• vertical

Mountains form at a ___________ boundary.

• transform
• divergent
• convergent
• subduction

What type of boundary is shown at A?

• transform
• convergent
• divergent
• subduction

What is happening at point B?

• subduction
• a divergent boundary
• convection
• an earthquake

one tectonic plate moves under another

• convergent plate boundary
• divergent plate boundary
• transform plate boundary
• subduction

a boundary at which two plates move away from each other

• convergent plate boundary
• divergent plate boundary
• transform plate boundary
• subduction