Freshwater Review

What is a watershed?

• The level below the ground where the ground is saturated

• Layers of rock or sediment that allow ground water to pass freely

• Land area from which surface run-off drains into a system of rivers and streams

• Movement of water from the oceans to the air

Which of the following is created as sediment is continuously deposited along the banks of a river, creating a natural flood barrier?

• Levee

• Floodplain

• Delta

• Alluvial Fan

Increased nitrate levels can be due to which of the following?

• Fertilizers from agriculture

• Manure from livestock

• Sewage from human development

• All of these answers are correct

The world’s water crisis is due to

• Increasing human populations

• Over polluted water

• Overuse of available water

• All of these answers are correct

Changes in the depth of the water table does NOT depend on:

• Precipitation

• Drought

• Over use of wells

• Amount of pollutants entering the system

In what areas would we likely see salt water intrusion?

• Coastal areas where the water table is extremely high

• Coastal areas where groundwater has been overdrawn

• Inland areas where the water table is extremely high

• Inland areas where groundwater has been overdrawn

The most difficult type of pollution to prevent and/or clean up is

• point source pollution

• nonpoint source pollution

Which 2 sources of freshwater are used for drinking water?

• Oceans and icebergs

• Groundwater and oceans

• Rivers and groundwater

• Icebergs and rivers

What percentage of the water on earth is saltwater?

• 50

• 70

• 92

• 97

Where is most of our freshwater found?

• Groundwater

• Icecaps and glaciers

• surfacewater

• in the atmosphere