Final Review

 When water vapor changes to liquid water 

• evaporation
•  condensation
• humidity
• precipitation

Why is most of Earths freshwater is not available for human use.  

• because it's in the ground
• because it's frozen in ice caps and glaciers
• because of pollution
• because of global warmin

What percent of Earth’s water is freshwater 

• 1%
• 2%
• 3%
• 5%

What is Salinity? 

• how much salt is in any given liquid
• salt on the rocks
• how much salt is in takis

What technology is used to measure the depth of the ocean?

• submarine
• sonic
• sonar

What causes deep ocean currents?

• moon's gravitational pull
• temperature, density, salinity
• wind

27.  What area of the ocean floor would have the greatest amount of pressure being exerted? 

• trench
• Rift Valley
• seamount

 What are mid ocean ridges and why are they important? 

• volcanic islands that are still active
• underwater mountain range that creates new sea floor
• Part of the Himalayan mountain range

How do clouds form? 

• smoke from factories
• when condensation near land freezes
• when water vapor condenses and cools 

What gives the water cycle its energy 

• sun
• moon
• fire
• ice