Earth's Water Test

What evidence supports the importance of the ocean in the water cycle?

• The ocean represents about 97% of Earth's water.

• The ocean provides most of the freshwater that people use.

• The ocean is saline, so it contributes dissolved salts to the water cycle.

• The ocean is not important to the water cycle because it is saltwater.

Which two statements about Earth's freshwater are supported by the graphs?

• Most freshwater is in glaciers and ice caps.

• Aquifers are the largest source of surface water.

• Only a very small amount of available water is freshwater.

• Saltwater represents only a small portion of available water.

Based on the circle graphs, which is the largest source of surface drinking water?

• lakes

• ocean

• aquifers

• wetlands

What provides the energy to power the water cycle?

• the sun

• gravity

• the wind

• air pressure

Which is the best label for the process labeled 2 in the drawing?

• collection

• evaporation

• precipitation

• condensation

Why does Tyler need to use boiling water in the investigation?

• The heat causes precipitation to form.

• The heat causes the water to turn into vapor.

• The heat causes the water droplets to condense.

• The heat helps to collect the water in a reservoir.

Which is the correct title for this diagram?

• Glacier

• Aquifer

• Permafrost

• Saltwater

Which two solutions address the lack of human access to clean water?

• reducing usage

• melting glaciers

• digging aquifers

• digging canals in wetlands

A city has limited access to freshwater resources, so the city builds this structure. How does this structure help solve the problem of limited freshwater?

• It cleans polluted water.

• It collects and stores water.

• It accesses aquifers underground.

• It promotes evaporation for the water cycle.

Which diagram shows the importance of oceans in the water cycle?