Ocean floor lecture

Which feature of the ocean floor is characterized by a very gradual slope where water would flow extremely slowly?

• The continental slope

• The abyssal plain

• The continental shelf

• A trench

What is characteristic of an abyssal plain?

• A steep drop-off

• A flat area with few structural features

• The deepest part of the ocean

• A mountain range in the middle of the ocean

How are mid-ocean ridges formed?

• By the collision of two oceanic plates.

• By magma rising as oceanic plates pull apart.

• By the gradual accumulation of sediment over time.

• By the erosion of existing underwater mountains.

What happens in a subduction zone when two plates collide?

• Both plates move upwards.

• Both plates move downwards.

• One plate moves upwards, and the other moves downwards.

• The plates slide past each other horizontally.

How does sonar work to map the ocean floor?

• It uses light waves to illuminate the ocean floor.

• It sends sound waves that bounce off the ocean floor and return.

• It uses magnetic fields to detect changes in the ocean floor.

• It measures the temperature differences in the water.