Oceans

Approximately what percentage of Earth's surface is covered by oceans?

• 40%

• 50%

• 20%

• 70%

Which ocean basin is the largest?

• the Atlantic
• the Indian
• the Pacific
• the Arctic

The gradually sloping submerged surface that extends from the shore towards the ocean basin is the

• continental shelf

• continental slope

• continental rise

• continental margin

The most abundant salt in seawater is

• calcium chloride
• magnesium chloride
• sodium chloride
• sodium chloride

Which process does NOT lead to a decrease in the salinity of ocean water?

• runoff from land

• precipitation

• sea ice melting

• evaporation

Micro-organisms that carry out photosynthesis and drift with ocean currents are

• nekton

• pelagic

• neritic

• plankton

Which term describes the upper part of the ocean into which sunlight penetrates?

• neritic zone
• intertidal zone
• oceanic zone
• photic zone

Because of the Coriolis Effect, surface currents in the Northern Hemisphere are deflected to the

• left

• right

• north

• south

The five huge circular-moving systems of ocean surface currents are called

• density currents
• fetches
• drifts
• gyres

A volcanic mountain that rises above the surface of the water is called an ____________

• trench

• island

• mid-ocean ridge

• seamount