Sea-Floor Spreading REVIEW

Front

Sea-floor spreading begins at the Mid-ocean ridge

Back

Mid-ocean ridge

Front

Magma, or molten material, __________ and hardens

Back

cools

Front

The oceanic crust is pushed aside on both sides of the

Back

Mid-ocean ridge

Front

The oceanic crust _________ when it reaches the continental crust.

Back

sinks

Front

The process that happens at the deep-ocean trench is called...

Back

subduction

Front

The land feature that happens when there is subduction is called a...

Back

deep-ocean trench

Front

New crust is always formed at the...

Back

mid-ocean ridge

Front

Older crust is found towards the... (Options: Mid-ocean ridge, Deep-ocean trench, Asthenosphere)

Back

Deep-ocean trench

Front

If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?

Back

It gets larger

Front

If there are more subduction zones than mid-ocean ridges, what happens to the ocean?

Back

It gets smaller