Front

What is the longest mountain chain on Earth called? (HINT: It runs through almost all Earth's oceans.)

Back

Mid-ocean ridge

Front

What has the greatest effect on plate movement? Options: radiation and continental drift, convection currents and thickness of plates, convection currents and density of plates, conduction and sea-floor spreading

Back

convection currents and density of plates

Front

In which of Earth’s layers are convection currents believed to be flowing? Options: lithosphere, outer core, inner core, asthenosphere

Back

asthenosphere

Front

The process that continually adds crust to the ocean floor is called __.

Back

sea-floor spreading

Front

What landform is most likely to form when two continental plates collide? Options: a rift valley, a deep ocean trench, a non-volcanic mountain range, the mid-ocean ridge

Back

a non-volcanic mountain range

Front

In the picture below, the ocean floor is sinking through a deep ocean trench and back into the mantle. What is this process called?

Back

subduction

Front

What happens between oceanic crust and continental crust at a subduction zone?

Back

the more dense oceanic crust sinks under the less dense continental crust

Front

Most geologists believe that the movement of the Earth’s plates is caused by __ in the __.

Back

convection currents, asthenosphere

Front

What theory states that lithospheric plates are in constant slow motion driven by convection currents in the asthenosphere?

Back

plate tectonics

Front

What type of boundary exists between the North American Plate and the Pacific Plate? (HINT: Look at the arrows.)

Back

transform boundary