WorksheetsWeek 23 Science
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
How do trees help the geosphere?
a)
They provide oxygen.
b)
They keep water clean.
c)
They prevent soil erosion.
d)
They offer shelter to squirrels.
2.
Why are trees called “the lungs of the Earth”?
a)
They clean soil pollution.
b)
They limit noise pollution.
c)
They absorb air pollution.
d)
They reduce water pollution.
3.
What is deforestation?
a)
burning trees for warmth
b)
harvesting fruit from trees
c)
cutting down lots of trees
d)
using trees to build houses
4.
How many square miles of forest are cleared every 10 years?
a)
100,000
b)
350,000
c)
500,000
d)
780,000
5.
Which basic need do trees NOT supply?
a)
air
b)
food
c)
shelter
d)
water
6.
Why would it take a long time for cleared land to become forest again?
a)
Grasses and flowers block sunlight.
b)
Trees require animals to live in them.
c)
It takes a long time for trees to grow.
d)
Trees do not like to grow on bare soil.
7.
What is a watershed?
a)
all of the water in a lake
b)
a forest with a large river
c)
all precipitation that falls onto soil
d)
a region that drains into one outlet
8.
Why does the water in a watershed end up at the same body of water?
a)
All precipitation falls into it.
b)
Water vapor is attracted to it.
c)
Animals carry all of the water to it.
d)
The land is sloped in that direction.
9.
How might humans make a watershed unhealthy?
a)
cutting down all of the trees
b)
planting a backyard garden
c)
drinking water from a faucet
d)
stopping soil erosion on rivers
10.
Where does all water on Earth eventually flow?
a)
marshes
b)
oceans
c)
reservoirs
d)
springs
11.
What is a source of runoff pollution?
a)
oil leaking from cars
b)
trees shedding leaves
c)
bees collecting pollen
d)
predators hunting prey
12.
How can people keep the watershed healthy?
a)
Stop cooking with water.
b)
Properly dispose of waste.
c)
Provide habitats for songbirds.
d)
Turn off unused lights at home.
13.
Why should very little fertilizer be used in a garden?
a)
to avoid polluting runoff
b)
to help plants grow bigger
c)
to make the vegetables tastier
d)
to keep bugs away from the plants
14.
How does overwatering cause a problem for watersheds?
a)
It creates runoff.
b)
It destroys habitats.
c)
It causes a drought.
d)
It prevents flowering.
15.
How much of Earth does the ocean cover?
a)
3 percent
b)
12 percent
c)
60 percent
d)
75 percent
16.
What is the term for removing too many fish?
a)
deforestation
b)
overfishing
c)
precipitation
d)
weathering
17.
What would happen if ocean ecosystems disappeared?
a)
People would go hungry.
b)
The ocean would become saltier.
c)
More tsunamis would be created.
d)
Hurricanes would become stronger.
18.
Why can’t countries stop boats from fishing?
a)
People would be out of work.
b)
It is against the law to forbid fishing.
c)
Ocean temperatures would increase.
d)
The ocean would become overpopulated.
19.
Why do people overfish?
a)
They do not like the ocean.
b)
They are trying to find new jobs.
c)
They want to empty the ocean.
d)
They need to feed many people.
20.
How do scientists know where boats fish?
a)
They ask the boat captains.
b)
They use satellites to track them.
c)
They ride on the boats every day.
d)
They run DNA tests on the caught fish.
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