Name:     ID: 
 
Email: 

Hydrology Mid-Term

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

What powers the water cycle?
a.
rain and snow
c.
springs and wells
b.
ocean currents
d.
sun’s energy
 

 2. 

The physical change of liquid water into water vapor is called
a.
desalination.
c.
condensation.
b.
evaporation.
d.
precipitation.
 

 3. 

Which process helps form a cloud?
a.
evaporation
c.
condensation
b.
precipitation
d.
warm air
 

 4. 

What is an aquifer?
a.
a lake where cities get their water
b.
soil deposited by slow moving rivers
c.
the top layer of a soil horizon
d.
an underground layer of permeable rock containing water
 

 5. 

How is ocean water different than the water in rivers?
a.
it is always colder
c.
there is more of it
b.
it contains salt
d.
it evaporates easier
 

 6. 

What happens to the ocean water that is left behind after evaporation?
a.
It gets hotter.
c.
It moves faster to stay warm.
b.
It gets less dense.
d.
Its salinity increases.
 

 7. 

How are deep currents different from surface currents?
a.
They are warmer and faster.
c.
They are denser and slower.
b.
They are caused by winds.
d.
Some are colder than others.
 

 8. 

What is the lowest point of a wave?
a.
crest
c.
wave height
b.
trough
d.
wavelength
 

 9. 

Warm air rises because
a.
it is less dense than cold air
c.
it has less energy than cold air
b.
it contains helium
d.
is more dense than cold air
 

 10. 

What causes an area of high air pressure?
a.
warm air
c.
cold air
b.
strong winds
 

 11. 

The movement of air from an area of high pressure to an area of low pressure is
a.
the coriolis effect
c.
weather
b.
the wind
 

 12. 

During the day, warm air over the land rises and cool air moves in from the sea.  This creates a
a.
a sea breeze
c.
a tsunami
b.
a hurricane
d.
land breeze
 

 13. 

   Clouds form when water vapor in the air  
a.
encounters a warm front.  
c.
rises too high to fall to the ground.  
b.
cools and condenses around smoke or dust particles  
d.
rises and disappears.  
 

 14. 

A barometer is used to measure what?
a.
air pressure.
c.
snow depth
b.
rainfall.
d.
wind speed.
 

 15. 

The Earth’s surface
a.
has the same amount of land and water
c.
has about three times more water than land
b.
is covered by more water than land
d.
is covered mostly by water
 

 16. 

     
In the morning, Mary noticed there was dew on the grass. In the afternoon, the grass was dry. What most likely happened to the water?
a.
it formed clouds..
c.
it went into the ground
b.
it no longer exists
d.
it went into the air
 

 17. 

Were is most of Earth's freshwater found?  (we can’t use it)
a.
ocean and seas
c.
glaciers and the polar ice caps
b.
groundwater
d.
lakes and rivers
 

 18. 



The amount of water on the earth
a.
is always increasing because of rain
c.
changes from year to year because of the weather
b.
is never the same because we keep using it
d.
stays the same because of the water cycle
 

 19. 

Only fresh water moves through the water cycle because
a.
salt water has a separate cycle
c.
salt water is too heavy to evaporate
b.
salt water only rains back into the ocean
d.
only the water evaporates and the salt gets left behind.
 

 20. 

Which natural force creates surface ocean currents? 
a.
gravity
c.
the wind
b.
sunlight
d.
earthquakes
 



 
         Start Over