Unit 5 Evaluate

Which human activity directly affects the quality of freshwater resources?

• depletintg the ozone layer

• throwing trash out of car windows

• burning gasoline in car engines

• allowing runoff from agriculture fields

What would most likely result if more farms were developed along river basins in North Carolina?

• an increase in average rainfall

• an increase in water pollution

• an increase in nonnative species

• an increase in severe weather events

A rural, forested area recieves a lot of rain in a short amount of time. What would most likely cause potential flooding in the area.

• if the ground of the area is mostly sandy soil

• if the ater level in the area is below the zone of saturation

• if the ground of the area is already saturated with water

• if the area has a large uncharged aquifer beneath it

Which result is most likely to occur after excessive withdrawal of groundwater in coastal areas?

• intrusion of salt water into the water table

• dilution of brackish water in estuarine ecosystems

• reduced efficiency of local desalination facilities

• increased reliance on irrigation because of drier soil conditions

Which is the most common contamination source for freshwater resources?

• lightning

• run-off

• melting of glaciers

• digging wells

Groundwater flows through a layer of subsurface material called an aquifer- made up of which types of materials?

• clay and silt

• gravel and sand

• granite and basalt

• marble and schist

Because water can hold a large amount of heat, which effect do oceans have on nearby land areas?

• They lower the freezing point of fresh water

• They provide the energy that triggers volcanic events

• They form high-pressure areas that cause magma currents

• They prevent rapid extreme temperature changes.

What is most responsible for the presence of groundwater in an area?

• the movement of surface water and precipitation through soil and rock

• the movement of water from streams and rivers to watersheds

• the movement of surface water through impermeable rock

• the movement of water from a confined aquifer into surface water

Which would most likely result if more farms were developed along river basins in North Carolina?

• an increase in severe weather events

• an increase in water pollution

• an increase in average rainfall

• an increase in nonnative species

Which statement BEST explains the role of evaporation in ocean currents?

• Evaporation leads to the movement of air masses, causing surface currents.

• Evaporation removes salt to surface waters, forcing the water to sink.

• Evaporation removes heat energy from surface waters, increasing the water density.

• Evaporation increases the air pressure above surface waters, causing horizontal currents.