Human Impact and Activity

_______ make up 30% of the animal protein consumed by humans in the world.

• Shellfish

• Finfish

• Marine mammals

• Aquacultured fish

The largest fish catches are those of:

• tunas

• clupeoids

• cold water species

• salmon

Which of the following is an example of a non-renewable resource?

• shellfish

• finfish

• oil

• seaweeds

Which of the following is NOT a problem caused by fish farming?

• higher levels of chemicals in the fishes' bodies

• release of pollution into the environment

• threats to genetic identity of wild fish

• increased price of fish

Junk fish that are caught while fishing for more valuable species and are thus discarded are called :

• by-catch

• sustainable yeild

• overfishing

• eutrophication

Desalination plants :

• extract minerals for industrial use from seawater

• convert seawater into freshwater

• extract table salt from seawater

• convert seawater into brackish water for industrial use

Potential sources of energy from the sea include :

• tides

• waves

• differences in temperature between deep water and surface water

• currents

Tidal energy is a _____.

• renewable resource

• non-renewable resource

_____ is defined as adding substances or energy that harm the environment.

• By-catch

• Pollution

• Polymetallic nodule

• Eutrophication

Which of the following is a cause of hypoxic, or "dead zones" in the ocean?

• oil pollution from tanker dishcharge

• lead pollution from heavy industry

• eutrophication due to algae blooms

• thermal pollution from power plants