What is nitrogen fixation?
Biogeochemical Cycles

Flashcard
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Science
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The process by which certain bacteria convert atmospheric nitrogen (N2) into ammonia (NH3), making it available for plants.
2.
FLASHCARD QUESTION
Front
What is the most abundant gas in the atmosphere?
Back
Nitrogen, which makes up about 78% of the Earth's atmosphere.
3.
FLASHCARD QUESTION
Front
What process do plants use to convert carbon dioxide into glucose?
Back
Photosynthesis.
4.
FLASHCARD QUESTION
Front
What is combustion?
Back
The process of burning fossil fuels, which releases carbon dioxide (CO2) back into the atmosphere.
5.
FLASHCARD QUESTION
Front
What role do decomposers play in biogeochemical cycles?
Back
Decomposers break down dead organic matter, returning nutrients to the soil and making them available for plants.
6.
FLASHCARD QUESTION
Front
What is the phosphorus cycle?
Back
The biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
7.
FLASHCARD QUESTION
Front
How do humans impact the carbon cycle?
Back
By burning fossil fuels, deforestation, and industrial activities, humans increase the amount of carbon dioxide in the atmosphere.
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