2018 Hydrosphere Unit Review ****

Which provide the best source of information about the quality of water in aquifers?

• wells

• lakes

• septic tanks

A scientist collected water quality data in a protected estuary over time. The scientist measures a nitrate level of 6 ppm, and a dissolved oxygen level of 2 mg/L. Which would the scientist most likely conclude about this site?

• The nitrate and oxygen levels are normal.

• The nitrate levels are high, and the oxygen levels are low.

• The nitrate levels are high, and the oxygen levels are healthy.

• The nitrate levels are low, and the oxygen levels are unhealthy.

Which best describes an economic trade-off a community must make in order to maintain acceptable water quality?

• enforcing environmental regulations to prevent point-source pollution

• organizing informational meetings to prevent potential zoning restrictions

• providing tax incentives for potential industrial development and expansion

• developing community awareness programs to educate farmers about pesticides

Which is the best way to conserve water?

• Take a daily bath rather than a shower.

• Wash several small loads of clothing rather than a few large ones.

• Use the dishwasher only for small loads rather than for large loads.

• Install low-flow toilets that reduce the amount of water being flushed.

Oceans cover about 70% of the surface of the Earth and form layers based on water depth. Which best describes a factor that is the same for the different layers of the oceans?

• amount of oxygen

• amount of light

• amount of salt

Which is most likely an example of point source pollution?

• fertilizer sprayed onto a field

• water runoff from a city street

• a pipe flowing into a river

Which event will most likely cause increased turbidity in a lake or pond?

• increase in runoff

• decrease in runoff

• increase in aquatic plants

• decrease in aquatic plants

Which best allows humans to utilize water as a resource?

• pollution laws

• local geography (land)

• energy conservation

Which type of ocean water would contain more dissolved oxygen?

• cold ocean water in polar regions

• warm ocean water in tropical regions

• temperate ocean water in subtropical regions

Why are estuaries often valued as the center of human coastal communities?

• Estuaries create mild habitats for deep sea life.

• Estuaries enhance marine biology resources for the future.

• Estuaries are needed to filter pollution out of ocean water.

• Estuaries provide a place for people to live, fish, and swim.