Retake Seafloor Spreading Quiz

Mid-ocean ridges are where...

• New crust is created

• Crust is destroyed

Ocean trenches (ridges) are where...

• new land is created

• old land is destroyed

The further the bands of land are from the mid ocean ridge, the ________ they are.

• Older

• younger

• hotter

Sea floor spreading is:

• The gradual movement of the continents across the earth's surface through geological time.

• The formation of new crust caused by magma rising at ocean ridges.

• The idea that newer crust is located closer to the mid ocean ridges.

Plates sink at trenches because:

• They are younger and weaker.

• They are more dense

• They are less dense

The gradual movement of the continents across the earth's surface through geological time is called...

• Seafloor spreading

• Continental Drift

• Pangaea

The bands of land on both sides of the mid ocean ridges are______.

• The same on both sides

• Different on both sides

• Unknown

Mid-Ocean ridges form long chains of "______" that rise up from the ocean floor.

• Rivers

• Valleys

• Mountains

• Rocks

In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.

• True

• False

• Scientists are not sure

Seafloor spreading is consistent at all mid-ocean ridges. 

• True

• False