Hydrosphere Review

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

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.

According to the graph below, what happens to the density of a substance as its salinity increases (as you move up on the y-axis)?  (Helpful tip: pick at least 2 salinities and find their densities on the graph.  Compare.)

• As salinity increases, density stays the same.
• As salinity increases, density decreases.
• As salinity increases, density also increases.

According to the graph below, what happens to the density of a substance as its temperature increases (as you move up on the y-axis)?  (Helpful tip: pick at least 2 temperatures and find their densities on the graph.  Compare.)

• As temperature increases, density stays the same.
• As temperature increases, density decreases.
• As temperature increases, density increases.

Certain stages of the water cycle are most likely occurring under certain weather conditions.  Which stage is most likely going to occur on a warm, sunny day?

• precipitation
• condensation
• evaporation

Hurricanes form over the ocean.  Which type of ocean water are hurricanes likely to gain strength?

• cooler water where less evaporation is occurring
• warmer water where more evaporation is occurring
• hurricanes ONLY occur over land

What is the water cycle?

• the 3 forms of water
• the movement of water on, above, or below the surface of the Earth
• when water melts
• when clouds form