5th Atmosphere, Hydrosphere, Lithosphere

Study the graph below.  Where is most of the Earth's water located?

• Rivers and Lakes
• Glaciers and Icecaps
• oceans
• groundwater

Why is MOST of the freshwater on Earth not available for our use?

• All freshwater on Earth is easily accessible for use.
• It is frozen in the icecaps and glaciers.
• It is surface water.
• It is underground.

Which of the following is caused by the gravitational pull of the moon and sun?

• ocean waves
• ocean tides
• ocean currents

How much of Earth's water is unavailable for humans to consume due to its high salinity? 

• 3%
• 23%
• 77%
• 97%

Why must humans clean water before using it? 

• Humans are unable to digest untreated river water
• River water is free of any contaminant or pollutants
• Untreated river water is brown and humans prefer clear water
• Clear water may contain contaminants that could harm humans
  

How does the amount of water circulating in the water cycle change?

• The amount of water remains constant
• The amount of water increases each time it rains
• he amount of water decreases and then increases each day
• The amount of water decreases every time evaporation occurs

Why is such a small amount of freshwater available for humans to readily use?

• Majority of freshwater is mixed in with the ocean water
• Most of fresh water is frozen in glaciers and polar ice caps
  
• Most of freshwater found in the gas form in the atmosphere
• Most of freshwater is liquid in lakes, rivers , & aquifers

All the water on, in , and surrounding the earth

• Atmosphere
• Hydrosphere
• Biosphere
• Lithosphere

What do we use water for the most? 

• mining
• agriculture
• drinking water
• transportation

Which is most likely an example of point source pollution?

• fertilizer sprayed onto a field
• water runoff from a city street 
• a pipe flowing into a river