Unit 7

Ninety-seven percent of the world's water resources are found in

• freshwater

• glaciers and icecaps

• saltwater

• groundwater

Earth's surface water is found in

• lakes

• streams

• rivers

• all of the above

Most of the oil that pollutes the oceans comes from

• operating boats and personal watercraft

• spills from oil tankers

• runoff from cities and towns

• leaking underground storage tanks

How is freshwater used in industry?

• in manufacturing processes

• to generate power

• in the disposal of waste products

• all of the above

Many areas of the world that do not have adequate or enough fresh water have become habitable because

• rainfall patterns have changed

• water management projects have diverted water to the areas

• icebergs have been towed in to provide fresh water

A hole that is dug into the ground to obtain freshwater is called

• the recharge zone

• a well

• an aquifer

• a watershed

Which of the following is one way that a person can conserve water?

• take a bath instead of a shower

• do small loads of laundry

• use a low-flow shower head

• water the lawn every morning before the sun comes up

Which of the following a source of point-pollution?

• unlined landfill

• runoff from city streets

• precipitation containing air pollution

• runoff from farms

Polluted groundwater is difficult to clean up because

• groundwater is deep in the ground and spreads it to large areas of rock

• pollutants cling to the rocks that build the aquifer and pollute the clean water

• recharging the groundwater can take hundreds or thousands of years

• all of the above

Letter "A" in the picture shows

• a well

• groundwater

• aquifer

• surface water