The amount of water on Earth is...

• always the same
• constantly changing
• steadily increasing
• steadily decreasing

About what percentage of Earth’s water is freshwater?

• 97%
• 50%
• 32%
• 3%

Which of the following contains the largest percentage of the Earth's total water?

• Atmosphere
• Oceans
• Ice/Snow
• Vegetation

Where is most of the earth's fresh water stored today?

• in glaciers and polar ice sheets
• in rivers and lakes
• in the oceans
• in groundwater

What is one driving force for the water cycle?

• The gravitational force of the Moon
• The gravitational force of the Sun
• The heat from the Sun
• The heat from the Moon

Evaporation is the process which...

• a gas is converted into a liquid​
• a liquid is converted into a gas
• a solid is converted into a liquid

Which is a process by which water vapor ENTERS the atmosphere?

• condensation
• transpiration
• precipitation
• radiation

Clouds form when . . .

• rain, snow, sleet, or hail fall to Earth's surface, pulled down by gravity
• moist air cools and the water vapor condenses around tiny dust particles
• warm moist air rises because the molecules have more energy, move away from each other, and the less dense gas floats upwards
• water evaporates from a body of water like an ocean

What happens to air as it rises into the atmosphere?

• The air heats up
• The air cools down
• The air temperature remains constant
• None of the above

What sequence of processes transports water from the ocean into a cloud?

• Evaporation and condensation
• Condensation and freezing
• Precipitation and condensation
• Evaporation and precipitation