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2.3 Nutrient cycles (Carbon cycle (carbon found in or created by something…
2.3 Nutrient cycles
Carbon cycle
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Carbon is cycled. through the atmosphere: photosynthesis by plants, trees and phytoplanton that remove CO2 from the air and water and aerobic respiration.
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Marine sediments are Earth's largest store of carbon, mostly carbonates.
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Nitrogen cycle
Nitrogen gas only becomes a plant nutrient as a component of nitrogen -containing ammonia , ammonium ions and nitrate ions.
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Plants and animals decompose , Bacteria breaks down protein and DNA into ammonia
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The phosphorus cycle
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phosphates in soil are good for plants. But artificial phosphates leak easily into nearby water. Phosphates are bad news for aquatic ecosystems.
water runs over exposed rocks and slowly erodes inorganic compounds containing phosphate ions which then are absorbed by plant's roots and move through food webs.
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Phosphates can also be found embedded in rocks that will uplift to the surface again million of years later.
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carbon
used in organic macromolecules: Sugar, carbohydrates , fats proteins, DNA , etc.
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Nitrogen
Used in organisms DNA, RNA and proteins
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