List 5 ways in which people might affect the water cycle :

1. Pollutants from burning fossil fuel and vegetation.
2. By cutting down the amount of heat reaching the ocean, which initiates the cycling of water vapour.
3. Such as mining, industry, agriculture, rural and urban settlements are currently responsible for the deterioration of the ecological integrity of this river system.
4. Humans disrupt the drainage basin cycle by accelerating processes, and creating new water storage reservoirs or by abstracting water.
5. A local level deforestation can have immediate effects on the hydrological cycle.

What does it mean to "fix" nitrogen?

• In nature, most nitrogen is harvested from the atmosphere by microorganisms to form ammonia, nitrites, and nitrates that can be used by plants.
• It is a chemical process by which molecular nitrogen in the air is converted into ammonia or related nitrogenous compounds in soil or aquatic systems.

List 3 ways in which nitrogen can be fixed

1. Nitrogen fixation is the process by which nitrogen gas from the atmosphere is converted into different compounds that can be used by plants and animals. They release nitrogen back into the air after they die, making it available to other live plants.
2. Nitrogen-fixing symbiotic associations are the relationships between legumes and Rhizobium and Bradyrhizobium bacteria.
3. The amounts of nitrogen are fixed as ammonia, nitrites, and nitrates by soil microorganisms.

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