Hydrosphere Oceans Review

What would most likely happen to the entire ocean food web if plankton were not available?

• All organisms that live in the ocean would not survive.

• The organisms would adapt and find another source of food.

• Only whales and other large ocean mammals would be affected.

• Only organisms in the deep ocean would survive

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How does burning fossil fuels on land impact CO₂ levels in the ocean?

• If oceans absorb too much CO₂ from the atmosphere, then the water increases in turbidity, harming marine life.

• As oceans absorb CO₂ gases from the atmosphere, their dissolved oxygen levels decrease, harming marine life.

• Oceans absorb CO₂ gases until levels become too high, then they can no longer be processed by the ocean and become harmful to marine life.

• Oceans absorb CO₂ gases from the atmosphere, CO₂ levels and dissolved oxygen levels increase, harming marine life

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In which oceanic zone do clams and crabs survive by burrowing in the sand?

• oceanic

• intertidal

• deep ocean

• open ocean

Which area of deep ocean research provides the most economic benefit?

• hydropower

• new habitats

• oil resources

• seafloor spreading

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Why are upwellings in the ocean essential for some organisms to survive?

• because many animals need low-tide conditions each day

• because currents carry predators away from the surface

• because the warm water kills bacteria before it can harm plankton

• because needed nutrients and dissolved gases are brought into new areas

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Of the elements that make up ocean water (BESIDES hydrogen and oxygen), what are the TWO MAIN elements found?

• chlorine and sodium

• magnesium and oxygen

• calcium and sulfur

• nitrogen and carbon

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Which is able to give the most detailed information about the topography of a large area on the ocean floor?

• sonar

• submersibles

• satellite imagery

• teams of scuba divers

How is sonar used to map the surface of the ocean floor?

• Light waves are used to take pictures of the ocean floor.

• Various temperatures are measured to determine the depth of the ocean floor.

• Scuba divers take videos and photographs to document their trips to the ocean floor.

• Sound waves are emitted and bounced off the ocean floor to

  determine the distance from the receiver.

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To which condition do all species in the ocean depths have to adapt?

• lower salinity

• extreme pressure

• swift ocean currents

• hot water temperature

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Which best describes the most abundant form of ocean life?

• fish

• algae

• microbes

• sharks