Ocean features

What is the bottom of the ocean like?

• Covered in ice

• A flat, unchanging surface

• Completely dry

• Higher mountains and deeper valleys than on land

How do scientists study the ocean floor?

• Using satellites only

• By sending animals with cameras

• Using sound waves to map the topography

• By diving themselves to the bottom

What happens at a divergent plate boundary under the ocean?

• The ocean dries up

• Nothing happens

• Plates move away from each other, creating a ridge

• Plates move towards each other

What is a rift valley?

• A mountain range

• A valley under the ocean

• A valley formed by the wind

• A deep crack at the center of a ridge under the ocean

What is the Mariana Trench?

• The highest mountain in the world

• A large volcano

• A deep trench formed at a subduction zone

• An underwater city

How do volcanoes form at subduction zones?

• Due to meteor impacts

• When the downward plate melts and magma rises

• By the accumulation of sediment

• Through erosion

What are hot spots?

• Areas where water is warmer

• Locations where magma rises up through a crack in the crust

• Places where the ocean is deepest

• Regions with the most fish

What is the continental shelf?

• A bookshelf made from continental wood

• The deepest part of the ocean

• The portion of the continent that is underwater

• A type of underwater mountain

What marks the beginning of the continental slope?

• A decrease in water temperature

• The end of the ocean

• A sudden increase in depth

• The appearance of coral reefs

What is the Abyssal plane?

• A type of underwater aircraft

• A flat region with sediment buildup

• The highest point in the ocean

• A deep trench