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Questions and Answers
What is the primary reason for humans to add nitrogen to soil?
What is the primary reason for humans to add nitrogen to soil?
- To reduce nitrogen absorption by plants
- To promote plant growth and chlorophyll production (correct)
- To increase soil acidity for specific crops
- To inhibit the nitrogen cycle
Where is most of the Earth's nitrogen found?
Where is most of the Earth's nitrogen found?
- In living organisms
- In the Earth's crust
- In the oceans
- In the Earth's atmosphere (correct)
How are fossil fuels primarily formed?
How are fossil fuels primarily formed?
- From chemical reactions in the Earth's core
- From volcanic eruptions
- From the compression of organisms over millions of years (correct)
- From the decay of plant matter in the soil
What are the primary processes through which carbon dioxide returns to the atmosphere?
What are the primary processes through which carbon dioxide returns to the atmosphere?
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What is the primary role of bacteria in the nitrogen cycle?
What is the primary role of bacteria in the nitrogen cycle?
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Study Notes
Nitrogen in Soil
- Humans add nitrogen to soil to promote plant growth and increase crop yields.
Nitrogen Distribution
- Most of the Earth's nitrogen (about 78%) is found in the atmosphere in the form of nitrogen gas (N2).
Formation of Fossil Fuels
- Fossil fuels are primarily formed from the remains of ancient plants and animals that have been buried for millions of years under heat and pressure.
Carbon Cycle
- Carbon dioxide returns to the atmosphere through primary processes such as:
- Respiration by living organisms
- Decomposition of organic matter
- Volcanic eruptions
Nitrogen Cycle
- The primary role of bacteria in the nitrogen cycle is to convert nitrogen gas (N2) into forms that can be used by plants, such as ammonia (NH3) and nitrate (NO3-).
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