Cycles

Eutrophication is caused by

• Excessive oxygen in bodies of water

• Excessive amounts of carbon in bodies of water

• Excessive amounts of acid in bodies of water

• Excessive amounts of nitrogen and phosphorus in bodies of water

As P and N build up, the probability of _______________ increases.

• lower BOD

• algal blooms

• oxygenation

• increased DO

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How does eutrophication cause the death of aquatic organisms

• the build up of carbon dioxide in the water

• the lack of nitrogen in the water

• the lack of carbon dioxide in the water

• the lack of oxygen in the water

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Which would most likely happen if too many nutrients entered an estuary?

• Nutrients would be used up by the fish and plants, keeping the estuary in balance.

• Algal blooms would lower dissolved oxygen levels, causing fish to suffocate.

• Algal blooms would decrease, leaving few food resources for fish.

• Nutrients would sink to the bottom, increasing soil deposition.

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Human activity can increase CO₂ levels in the atmosphere through

• Photosynthesis

• Burning of fossil fuels

• Planting more trees

• Removing nitrogen from fertilizer.

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The phosphorus cycle is unique in that

• It is the only nutrient that is used as fertilizer for crops.

• It is the only cycle that helps synthesize lipids.

• It does not cycle through the atmosphere.

• It is the only element that can be dissolved in water.

What of the following is NOT a way that people add carbon to the environment?

• Burning fossil fuels
• Deforestation
• Littering

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These gases, such as carbon dioxide, trap heat in the Earth's atmosphere causing global warming

• Global warming gases
• Hot House gases
• Green House gases
• Thermal pollution

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What happens when organisms die and decay? 

• Their nitrogen moves to the air as nitrogen gas
• Their nitrogen returns to the soil as ammonium
• Their nitrogen becomes tapped in clay and is unusable
• They stay on earth forever

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How does carbon in a grass plant get into a rabbit?

• The rabbit eats the grass

• Carbon from grass doesn't end up in a rabbit.

• The rabbit eats other animals that have carbon

• The rabbit breathes in carbon given out by the plant