Plate Tectonics Review

Compared to the Atlantic Ocean, the Pacific Ocean is

• staying the same size. 
• decreasing in size. 
• increasing in size.
• none of the above.

What type of boundary is the diagram showing and what is likely to occur?

• convergent boundary forming earthquakes
• convergent boundary forming volcanoes
• transform boundary forming volcanoes
• transform boundary forming earthquakes

What forms along subduction zones?

• glaciers 
• canyons 
• mid-ocean ridges 
• deep ocean trenches 

Why are volcanoes sometimes formed at convergent boundaries? 

• As oceanic and continental crust both sink into the mantle, rising magma forms volcanoes. 
• As oceanic crust sinks and melts at the boundary, the magma rises up through a weak spot in Earth’s crust. 
•  As oceanic and continental crusts collide, the impact melts the continental crust causing volcanoes to form. 
• As continental crust sinks below oceanic crust, lava is created and forms volcanoes. 

Where does volcanic and earthquake activity occur?

• Along plate boundaries
• Near the MOR
• At a rift valley
• Only transform boundaries

What is the diagram showing? 

• convergent boundary
• divergent boundary
• mountain boundary
• transform boundary

 A collision between two pieces of continental crust at a converging boundary produces a:

• rift valley. 
• deep ocean trench. 
• mountain range. 
• mid-ocean ridge. 

What landform would you expect to find at the boundary of the Nazca Plate and the South American Plate? 

• hot spot 
• mountain range 
• subduction zone 
• mid-ocean ridge 

What evidence did Wegener have to support his theory of continental drift?

• sonar readings of undersea mountains and proof of convection currents in the asthenosphere 
• matching fossils on different continents, landform shapes that align like puzzle pieces and tropical fossils found in cold climates 
• mass extinctions, rock layers and cave drawings 
• eye witness reports of the continents moving from one location to another 

The process by which the ocean floor sinks through a deep ocean trench and back into the mantle is known as:

• conduction. 
• convection. 
• subduction. 
• continental drift.