ESS Test 4 (12th) 21-22

What percentage of earth's surface is covered by water?

• nearly 70%

• nearly 50%

• nearly 90%

From all available freshwater, how much is frozen as polar ice caps?

• 69%

• 33%

• 50%

What is turnover time?

• It is the time it takes for a molecule of H₂O to enter an leave a aqueous system

• It is the time it takes for a molecule of CO₂ to enter an leave the atmosphere

• It is the time it takes for a molecule of O₂ to enter an leave the human body

What is the turnover time of groundwater?

• 35 000 years

• 9 days

• 300 years

Explain why water in oceans and polar ice caps are considered non-renewable resources

Warm ocean currents travel from

• the equator towards the poles

• the poles towards the equator

• none

Cold ocean currents flow from

• the equator towards the poles

• from east to west

• the poles towards the equator

The driving forces behind ocean currents are

• gravity and electromagnetic fields

• wind and earth rotation

• none

Ocean currents are important because

• large masses of water bring more fish

• large masses of water stabilize land's weather

• none

Explain why warm currents originate near the equator line