Oceans

The graphic shows ocean floor topography. Which is most likely represented by letter V (or W)?

• continental slope

• oceanic trench

• volcanic island

• abyssal plain

A seamount is an underwater mountain that peaks at least 1,000 meters above the ocean floor and does not reach the ocean's surface. Which letter on the diagram is a seamount?

• V

• W

• X

• Y

The picture shows the ocean floor topography. What is the ocean feature at point Y?

• continental slope

• midocean ridge

• seamount

• trench

A ship is mapping the structure of the ocean floor using sonar technology. Which describes the basic method used in this type of mapping?

• A radio wave is sent from the ship and reflects off the ocean floor back to a receiver on the ship.

• A sound wave is sent from the ship and reflects off the ocean floor back to a receiver on the ship.

• A radio wave is sent by the ship and is absorbed by the ocean floor.

• A sound wave is sent by the ship and is absorbed by the ocean floor.

Why is upwelling an important process in a marine ecosystem?

• Upwelling replaces sand and gravel on beaches lost as the result of wave and tidal action.

• Upwelling decreases the temperature differences between different layers of ocean water.

• Upwelling cycles nutrients from decomposers along the ocean floor to producers in surface waters.

• Upwelling returns salt to the surface from the benthic zone as part of the global conveyor belt current.

The process of removing salt from sea water.

• desaliniation
• salinity
• ocean water
• purification

The weight of the water pressing on an object.

• jetty
• water pressure
• desaliniation

What is the deepest part of the ocean?

• continental shelf
• abyssal plain
• trench
• tidal wave

What is the FLATTEST part of the ocean?

• abyssal plain
• continental shelf
• trench
• Mid Ocean Ridge

Produces most of our Earth's Oxygen

• trees
• grass
• phytoplankton