Env Sci Unit 3 Water Issues Study Guide

What happens in Eutrophication?

• A massive die-off of organisms due to low oxygen.

• An net increase in oxygen.

• A changing of a land biome from fertilizer.

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What is the original cause of eutrophication?

• Too many predators

• Too many herbivores

• Excess fertilizer

• Too much oxygen

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One of the primary human causes of dead zone formation is:

• Burning of fossil fuels

• Deforestation

• Overfishing

• Farming with fertilizers

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In eutrophication, dissolved oxygen levels decrease because

• bacteria use it as they decompose organic material

• algae uses it during photosynthesis

• it reacts with hydrogen to form H2O (water)

• fish use it up as they consume algae

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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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What is the main source of water pollution in a river, bay, or ocean?

• acid rain

• urban or farm runoff

• sediments

• air pollution

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Which is the most harmful form of land pollution?

• plastic

• paper

• branches and leaves

• food waste

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What is an example of harm microplastics have on marine animals?

• They can find plastic to play with

• They mistake the plastic for food.

• It uses up the oxygen in the water.

• It shades the water.

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What is it called when acids build up in the soil or water over time?

• Acidification

• Acid Shock

• Toxic Shock

• Eutrophication

An acid would have a pH....

• lower than 7

• equal to 7

• greater than 7