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WorksheetsReview Unit 4: Hydrosphere
Total questions: 21
Worksheet time: 12mins
Why is Earth called the blue planet?
Because it has almost all land.
Because it has a lot of water.
Because it has a lot of air.
Because it does not have gases.
How much of the Earth is covered in water?
97%
3%
75%
50%
97% of the water on Earth is
salt water
freshwater
potable
Where is MOST of the freshwater on the Earth TRAPPED?
in the ocean
in the seas
in the groundwater
in the glaciers and ice caps
Which graph correctly represents the water distribution on Earth?
A
B
C
none of them
Water is important because
it supports all life
it is used to cook and clean
it is used as a source of transportation
all of these are reasons water is important
Where can you find salt water?
oceans
rivers
lakes
clouds
Check all that are part of the hydrosphere
fish
glaciers
water vapor
rivers
What is sewage?
waste water (from your bathroom)
clean water
chlorine in the water
drinkable water
The process of cleaning water is called
water pollution
water purification
water shortage
water waste
Water pollution is
cleaning water to make it usable
when they add fluoride to the water
anything that makes the water dirty or unclean
when they add chlorine to the water
Potable water is
dirty water
sewage water
water vapor in the clouds
clean water that we CAN drink
Fluoride is added to toothpaste and to our water because
it kills bacteria
it makes them taste better
it prevents our teeth from getting cavitites
it is what gives them their color
During the purification process, chlorine is added to water because
it kills bacteria
it makes it taste better
it protects our teeth against cavitites
it makes the water last longer
Potable water is
the fresh water that we can drink
the ocean water
all of the water on Earth
Fresh water found under the Earth's surface is called
ocean water
river water
lake water
groundwater
Which is an example of industrial water pollution?
Sewage from your home
Trash from the street
An oil spill from a boat in the ocean
taking long showers
Fertilizers being used on crops is an example of which type of water pollution?
industrial
domestic
agricultural
When soil (la tierra) absorbs fertilizers, which water source is most likely to be contaminated?
oceans
glaciers
sewage
groundwater
ACCORDING TO THE GRAPH, why has the concentration of arsenic in water decreased so much between the years 1991-2000?
Because people have been conscious about that problem and haven't drank water so they do not get sick.
Because people stopped contaminating the river with arsenic waste.
Because authorities installed a water treatment plant specialized in identifying and treating the arsenic in water.
Because people started to use another river that had less contaminating levels of arsenic.
Where should you go to find the beginning of a river?
the ocean
the top of a mountain
the desert
the forest
