WorksheetsThe Carbon Cycle
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
When humans burn fossil fuels, most of the carbon quickly enters the as carbon dioxide.
a)
Water
b)
Atmosphere
c)
Sun
d)
Air
2.
What does not produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
3.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
decomposition and respiration
4.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
5.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
6.
Which of the following is the best conclusion that can be made from this graph?
a)
atmospheric carbon dioxide levels have been decreasing since 1960
b)
Hawaii has a lot of carbon dioxide
c)
humans have been working hard to decrease carbon dioxide levels
d)
atmospheric carbon dioxide levels have increased steadily since 1960
7.
The total amount of the carbon on Earth is constant.
a)
True
b)
False
8.
Which one of these does not add CO2 to the atmosphere?
a)
cooking with gas
b)
planting trees
c)
burning wood
d)
riding in a bus
9.
Combustion is another word for _______________.
a)
a train
b)
a bus
c)
a dog
d)
burning
10.
What process keeps Earth's temperature suitable for life
a)
Convention currents
b)
Greenhouse Effect
c)
Albedo Effect
d)
Water Cycle
11.
What is a carbon footprint
a)
the total amount of greenhouse gases that are emitted into the atmosphere
b)
the release of gas
c)
a place or environment where a plant or animal naturally or normally lives or grows
d)
a certain type of greenhouse gas
12.
Why does too much carbon dioxide in the atmosphere cause climate change?
a)
It cools our planet
b)
Blocks out UV rays
c)
Traps heat and warms planet
d)
Lets light escape
13.
How do humans affect the carbon cycle
a)
Inhaling oxygen
b)
Exhalation of carbon dioxide
c)
Using CFCs
d)
Wearing sunscreen
14.
Which is a true statement?
a)
Humans depend on oxygen, plants depend on carbon dioxide
b)
Plants produce carbon dioxide
c)
Humans depend on carbon dioxide, plants depend on oxygen
d)
Humans don't depend on plants for the air they need
15.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
100 %
