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Most of Earth's surface is covered with water. Only 2.5% of Earth's global water is freshwater. Of all the freshwater on Earth, 78% is frozen. Where is most of Earth's water found?

• glaciers

• lakes

• oceans

• rivers

Which part of the ocean would have the lowest salinity?

• in areas near melting glaciers

• in areas near the equator

• in areas with the highest temperatures

• in areas where there is little rainfall

Where is most of the Earth's freshwater located?

• in aquifers
• in rivers and streams
• in the ocean
• in icecaps and glaciers

Which of the following happens when the polar ice caps melt?

• headlands become valleys
• tectonic plates move
• sea levels fall
• sea levels rise

Aquifers are sources of

• freshwater, which is used for drinking, bathing, and watering crops.

• saltwater, which is pushed through turbines to make energy.

• oil, which is drilled from the aquifer and used to power homes.

• silica, which is used to make glass and paper products.

Why are oceans a major part of the water cycle?

• because they are large bodies of salt water that easily evaporate salt into the air

• because they are large bodies of salt water that fresh water can be evaporated from

• because the salt water condenses easily to become a gas in the air

• because the salt water runs off onto land to fill lakes and streams

Which pie chart shows the relative proportions of Earth's water in each location?

• 
• 
• 
• 

The graph shows the distribution of water on Earth's surface. What can be concluded from this image?

• Most of the freshwater on Earth is found in groundwater.

• Most of the the water available on Earth is drinkable.

• Most of the water available on earth is not drinkable

• Most of the freshwater on Earth is found in oceans.

The picture below shows the polar ice caps in the Arctic sea. What will happen to the ice caps if the Sun's energy gets stronger?

• The ice will become much colder, causing

  clouds to form less rainfall.

• The ice will become much harder, causing

  clouds to form more rainfall.

• The ice will become water, then the water will

  become vapor.

• The ice will become vapor, then the vapor will

  become water.

The model below shows the water cycle. What is the purpose of this model?

• to show how severe weather forms in the water

  cycle

• to illustrate how water travels from Earth's

  surface into the atmosphere and back to Earth's

  surface again

• to show how Earth's water formed billions of

  years ago

• to illustrate how some water is lost on Earth as

  some of it never returns to Earth's surface once

  it evaporates