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- 1. Multiple Choice
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
- 2. Multiple Choice
_____________ is an essential element of all living creatures.
Gold
Carbon
Carbon dioxide
Silver
- 3. Multiple Choice
The total amount of the carbon on Earth is constant.
True
False
- 4. Multiple Choice
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
- 5. Multiple Choice
Bacterias that decompose dead plants release _____________ back into the atmosphere.
water
nitrogen
oxygen
carbon
- 6. Multiple Choice
In the oceans; algae, plants, and other organisms use carbon from the atmosphere for ________________.
respiration
decomposition
transpiration
photosynthesis
- 7. Multiple Choice
Organisms that die in the ocean may __________ to the bottom and form limestone rock of a period of time.
sink
float
rise
increase
- 8. Multiple Choice
Ocean coral and oysters use carbon to create _________.
oxygen
shells
leaves
food
- 9. Multiple Choice
Limestone is a type of rock created from the ______________ of dead sea organisms.
waste
slime
shells
unknown
- 10. Multiple Choice
Over ________________ of years, once-living matter that remains in the ground can transform into fossil fuels.
millions
hundreds
thousands
a few handful
- 11. Multiple Choice
Since the mid- 1800's, _____________ activity has significantly altered the carbon cycle.
animal
plant
unknown
human
- 12. Multiple Choice
Burning fossil fuels has raised the concentration of ___________ in the atmosphere.
oxygen
rain
carbon
nitrogen
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