Unit 3a Lesson 1 Review

Use evidence from the lesson to explain how water is distributed on Earth's Surface.  

All water on Earth is recycled through __________.

• the water cycle

• 
  pockets of nitrogen

• exhaled gases

• dead plant and animal matter

True or False: The hydrosphere covers about 70% of Earth's surface.

• True

• False

About __________ of the world's water is salty ocean water. 

• 12 percent

• 43 percent

• 
  47 percent

• 97 percent

What represents all of Earth's water in the visualization?

• The largest dot

• The medium-sized dot

• The smallest dot

• None of the above

What is the primary source of freshwater for humans, plants, and animals?

• Glaciers

• Atmospheric water

• Underground water

• Surface freshwater

If Earth's water was in a gallon jug, how much would be freshwater?

• One cup

• One pint

• One teaspoon

• One tablespoon

Which lake holds about one-fifth of the world's freshwater?

• Lake Victoria

• Lake Superior

• Lake Baikal

• Lake Chad

What unique adaptation helps the nerpa survive under ice?

• They have super strong flippers

• They hibernate

• They can hold their breath for a long time

• They can change their coat color

What is the significance of the nerpa's extra blood?

• It allows them to store more oxygen

• It helps them stay warm

• It makes them swim faster

• It protects them from predators