Water on Earth

The oceans cover about what percentage of Earth?

• 25 percent

• 90 percent

• 75 percent

• 50 percent

What carries warm water toward the poles?

• rivers

• currents

• waves

• tides

A liter of cold water with high salinity _______ than a liter of warm water with low salinity.

• is lighter

• takes up less volume

• takes up more volume

• is heavier

Which is the best description of rivers, streams, and lakes?

• fresh groundwater

• surface fresh water

• surface salt water

• salty groundwater

How is a glacier formed?

• When water from a glacier flows into an ocean and freezes

• when a large piece of ice breaks off a glacier or ice sheet

• when ocean water freezes

• when an ice sheet cracks at its base

Water that fills spaces between particles of rock and soil is

• salt water

• rainwater

• groundwater

• reservoir water

What is the top level of groundwater in an aquifer called?

• water table

• water base

• water top

• water level

Which process below does NOT involve water vapor?

• Snow turns into water vapor by sublimation

• water vapor rises to form a cloud

• groundwater flows into the ocean

• ocean water evaporates, leaving salt behing

Dew forms during which part of the water cycle?

• precipitation

• condensation

• evaporation

• runoff

Sometimes, water vapor on a surface may freeze without becoming liquid water. What form when this happens?

• dew

• frost

• snow

• hail