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WorksheetsLiving Earth
Total questions: 25
Worksheet time: 25mins
The circulation of the element Carbon among Earth's atmosphere, land, oceans, and organisms is called _____________.
the Carbon Cycle
the Oxygen Cycle
the Carbon dioxide Cycle
the Water Cycle
_____________ is an essential element of all living creatures.
Gold
Carbon
Carbon dioxide
Silver
The total amount of the carbon on Earth is constant.
True
False
Carbon is used in the process called __________ by plants and algae to make food and the building blocks for growth.
carbon cycle
life
photosynthesis
decomposition
Burning fossil fuels has raised the concentration of ___________ in the atmosphere.
oxygen
ozone
carbon
nitrogen
Combustion is another word for _______________.
heating
cooling
boiling
burning
What process does not produce carbon dioxide?
Photosynthesis
Burning Fossil Fuels
Animal respiration
Plants decaying
How do living organisms return carbon to the atmosphere in the carbon cycle?
respiration and photosynthesis
decomposition and respiration
decomposition and photosynthesis
In what process is carbon dioxide transformed into chemical energy?
Photosynthesis
Respiration
Primary Production
Secondary Production
Carbon can be found in...?
The atmosphere
The ocean
Fossil fuels
All of the above!
Which is a true statement?
Humans depend on oxygen, plants depend on carbon dioxide
Plants produce carbon dioxide
Humans depend on carbon dioxide, plants depend on oxygen
Humans don't depend on plants for the air we breathe
Plants use ____________ to make their own food
Water
Sunlight
Carbon dioxide
All of these
Without the "greenhouse effect"
Overnight temperatures would plunge downward
Earth would catch on fire
Earth would heat up drastically
The atmosphere would leave
How does an increased level of dissolved carbon dioxide affect the ocean?
It decreases the amount of available oxygen
It causes the pH to become lower and more acidic
It causes the pH to become higher and more basic
it causes the amount of salt to increase
What is the main source of heat at the Earth's core?
Radioactive decay
Combustion
The greenhouse effect
Molten iron
