6.8 SOL Review Assessment

The model shows how water flows in two drainage basins. Identify the labeled features in the drainage basin on the left.

• 1—watershed; 2—parent rivers; 3—tributary

• 1—watershed; 2—tributaries; 3—parent river

• 1—divide; 2—tributaries; 3—parent river

• 1—divide; 2—parent rivers; 3—tributary

What separates watersheds?

• ridgelines

• oceans

• animals

• trees

The largest estuary in the United States is the (a)   Bay.

• San Francisco

• Chesapeake

• Hudson

• Tampa

Which example describes an estuary?

• area where fresh water and salt water mix with changing salinity and abundant life

• area where fresh water and salt water mix with stable salinity and little life

• area of fresh water with no salinity and abundant life

• area of salt water with high salinity and little life

Estuaries in Florida often have mangrove trees growing in them. The roots of the mangrove trees slow

the flow of the water, which allows soil particles to settle. If people were allowed to remove the

mangrove trees, how would the estuary environment most likely be affected?

• The amounts of nutrients in the water would decrease.

• More habitats for fish would be established.

• Populations of grasses would increase.

• The risk of erosion would be reduced.

Which three statements are true about building more dams for hydroelectric power production?

• It can increase global warming more than using fossil fuels.

• It disrupts aquatic ecosystems.

• It decreases the chances of a major flood affecting a town downstream.

• It decreases groundwater downstream from the hydroelectric power plant.

• It increases fish migrations upstream from the hydroelectric power plant.

The image shows a hydropower plant. How can the use of hydropower negatively affect the environment?

• It reverses the flow of water in the stream.

• It obstructs the migration of fish in the stream.

• It reduces the salt content in the stream.

• It increases the number of fish in the stream.

Which of the following could occur as the result of runoff of high nitrogen fertilizers from farmlands near a lake?

• an increase in algae growth resulting in low oxygen levels in the lake

• a decrease in mineral storage reducing carbon levels of the lake

• a decrease in pollution resulting in lower ozone levels in the lake area

• an increase in deforestation reducing animal populations in the lake area

Which is an abiotic factor that most limits the number of frogs living in a pond?

• the color of the water

• the number of predators

• the temperature of the water

• the populations of producers

The Ohio, Missouri, and Arkansas Rivers flow into the Mississippi River. Which term describes the Ohio, Missouri, and Arkansas Rivers?

• watersheds

• divides

• tributaries

• deltas