Seafloor Spreading

What is the continental shelf?

• The deepest part of the ocean

• The underwater edge of the continent

• A type of ocean trench

• A mountain range in the ocean

How deep is the continental shelf?

• Over a mile deep

• Less than 100 feet

• About 600 feet

• About 50 miles deep

What is the continental slope?

• A flat area of the ocean floor

• The deepest part of the ocean

• A steep slope leading from the continental shelf to the sea floor

• A shallow part of the ocean

What forms the abyssal plain?

• Volcanic activity

• Sand and mud burying hills and valleys

• The buildup of sediment at the continental rise

• Deep ocean trenches

What are seamounts?

• Deep valleys in the ocean

• Underwater volcanoes

• Flat areas on the ocean floor

• Edges of continents under water

How deep can ocean trenches be?

• Less than a mile

• About 100 feet

• About seven miles

• Up to 50 miles

What is the mid-ocean ridge?

• The edge of the continental shelf

• A chain of mountains on the ocean floor

• A flat area of the ocean floor

• A deep trench in the Atlantic Ocean

Tags

NGSS.MS-ESS2-2

What are seafloor vents?

• Deep valleys on the ocean floor

• Flat areas on the ocean floor

• Edges of continents under water

• Hot springs on the ocean floor

From the mid-ocean ridge, the oldest oceanic crust is found...

• on top of the ridge.

• near the mantle.

• farthest from the ridge.

• closest to the ridge.

New crust is created by...

• the spreading of cooled magma from the mid-ocean ridge.

• the convergence of tectonic plates.

• the creation of rift valleys.

• the subduction of an oceanic trench.

Tags

NGSS.MS-ESS2-3