4/12/2021 EOG Review (water)

4/12/2021 EOG Review (water)

River basins- an area of LAND that drains water into the closes river

• You live in the Lumber River Basin because our water flows to the Lumber River

Everyone lives in a watershed (the lowest point where water flows)

• many watersheds make up a River basin

• all water wants to flow back into the ocean

• small streams/tributaries collect water and join with larger rivers

Multiple Choice

Which best describes a characteristic of a river basin?

• they are a source of ground water

• they are saltwater ecosystems

• they flow down from aquifers

• they drain into the ocean

water quality can be tested a number of ways

• turbidity-cloudiness of water

• temperature- is affected by turbidity

• Dissolved oxygen- is affected by the temperature

• pH levels change with dissolved oxygen

• Bioindicators- living things that are sensitive to change (fish, frogs, insects..)

colder water hold more oxygen making it easier to sustain life.

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Multiple Choice

One dry summer, a large number of fish suddenly died in a shallow river. Which is the best explanation for this fish kill?

• the water became too warm to hold enough dissolved oxygen for the fish

• Heavy rains washed soil into the river, making it too muddy for the fish

• fertilizer caused too many algae to grow, and the fish died from overeating

• the water became too cold, stressing the fish so that they became sick and died.

Multiple Choice

Which of these is most likely to have a harmful effect on water quality?

• having water laws and regulations

• using chemical indicators to check water quality

• treating sewage to kill pathogens

• letting pollutants wash out to sea