Sea-Floor Spreading

Front

Massive pieces of land that are part of the Earth's crust and upper mantle

Back

Tectonic plates

Front

The deepest part of the ocean; long, narrow ditches

Back

Trenches

Front

___________ help explain why Earth is not getting any larger even though the tectonic plates are always moving.

Back

subduction zones

Front

The OLDEST seafloor is located?

Back

Farthest from the mid-ocean ridge

Front

True or False: Sea-floor Spreading adds new material to the ocean floor?

Back

True

Front

What happens when Subduction occurs?

Back

Parts of the crust fall into the mantle.

Front

True or false: Deep-Ocean Trenches are underwater canyons?

Back

True

Front

What did scientists use to map the oceans floor? (Options: Echo-location, Sonar, Space Shuttles, Animals)

Back

Sonar

Front

What are Mid-Ocean Ridges?

Back

A chain of underwater mountains

Front

What process takes place at the trenches?

Back

subduction