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12 questions
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
Bacterias that decompose dead plants release _____________ back into the atmosphere.
water
nitrogen
oxygen
carbon
In the oceans; algae, plants, and other organisms use carbon from the atmosphere for ________________.
respiration
decomposition
transpiration
photosynthesis
Organisms that die in the ocean may __________ to the bottom and form limestone rock of a period of time.
sink
float
rise
increase
Ocean coral and oysters use carbon to create _________.
oxygen
shells
leaves
food
Limestone is a type of rock created from the ______________ of dead sea organisms.
waste
slime
shells
unknown
Over ________________ of years, once-living matter that remains in the ground can transform into fossil fuels.
millions
hundreds
thousands
a few handful
Since the mid- 1800's, _____________ activity has significantly altered the carbon cycle.
animal
plant
unknown
human
Burning fossil fuels has raised the concentration of ___________ in the atmosphere.
oxygen
rain
carbon
nitrogen
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