Unit E: Fresh & Saltwater Systems Review

Which of the following represents the percentage of the world's water that is freshwater?

• 50%

• 23%

• 97%

• 3%

Which of the following pairs would represent the majority of freshwater on Earth?

• icecaps and groundwater

• lakes and streams

• groundwater and streams

• ice and lakes

Which of the following should not be present (in any amount) for water to be considered potable?

• Minerals

• Toxins

• Bacteria

• pH

Which technique for converting saltwater to freshwater requires a filter with small holes in it?

• Evaporation

• Distillation

• Distillation and evaporation

• Reverse osmosis

The water cycle is a model of what happens to water on the Earth. What is it called as droplets move up and into the atmosphere …

• evaporation

• condensation

• precipitation

• storage

What is the difference between a current and a wave?

• Waves only happen in freshwater and currents only happen in saltwater.

• Waves involve the movement of large bodies of water and currents happen on the surface.

• Waves are streams of water that flow deep inside tides.

• Waves happen on the surface and currents are streams of water that flow inside larger bodies of water.

What is the difference between a wave and a tide?

• Waves only happen in fresh water and tides only happen in salt water.

• Waves involve the movement of large bodies of water and tides happen on the surface.

• Waves are streams of water that flow deep inside tides.

• Waves happen on the surface and tides involve the movement of large bodies of water.

A river’s sediment load is the amount of …

• organisms it is able to sustain

• water-borne materials it can carry

• pollution it is able to filter out

• erosion it can make as it flows

Which of the following is NOT true of glaciers?

• They have a great affect on the land around them.

• They don't affect the land around them.

• They contain vast amounts of fresh water.

• They are melting and may eventually disappear.

Why are climates close to water more moderate than in other places?

• Water gives up its heat quickly.

• Water doesn't freeze.

• Water takes the heat from the land.

• Water keeps its heat for longer.