Hydrosphere 8.E.1.3

Which best describes the relationship between temperature and dissolved oxygen in a lake?

• As temperature increases, dissolved oxygen increases.

• As temperature increases, dissolved oxygen decreases.

• As temperature decreases, dissolved oxygen decreases.

• A change in temperature has no effect on dissolved oxygen.

Pure water is neutral. If water is neither an acid nor a base, what is the pH of water?

• 0

• 7

• 10

• 3

Which would MOST LIKELY result in an unhealthy aquatic habitat?

• a decrease in turbidity

• a decrease in nitrates levels

• an increase in water temperature

• an increase in dissolved oxygen levels

Turbidity measurements were taken at different distances from the shore of a lake.

Which best explains why the turbidity increases as water samples are taken closer to the shore?

• Shoreline erosion causes sediment to wash into the lake.

• Sediment is carried from the middle of the lake to the shore by wind.

• Swimmers stir up sediment by splashing in the water near the shore.

• Fish stir up sediment while feeding on plants that grow close to the shore.

The measure of how clear or cloudy a substance is

• Salinity

• Bioindicator

• Turbidity

• Eutrophication

Bio-indicators

• A measure of how acidic or how basic a liquid is

• An organism used to monitor the health of an ecosystem.

• a chemical that includes nitrogen and oxygen, often used as a fertilizer

• A measure of how turbid a water system is.

Eutrophication

• An organism used to monitor the health of an ecosystem.

• Too many nutrients in a body of water frequently due to runoff from the land. It causes a dense growth of plant life and death of animal life from lack of oxygen. (It can cause algal blooms)

• amount of oxygen that is present in the water.

• measure of how acidic or alkaline a water system is.

If a body of water has high turbidity levels, what can MOST LIKELY be concluded? 

• It has a low pH
• It is unsafe to drink 
• It is too hot to drink
• It contains a lot of chemicals 

If a large amount of fertilizer enters a lake, which will most likely happen?

• the fish population in the lake will increase
• the temperature of the lake will increase
• the number of fish dying in the lake will increase
• the available food supply for fish in the lake in increase

Which is the best example of a point source pollution?

• runoff from fields

• pesticides sprayed into the air

• oil spill from a boat on the Atlantic Ocean

• smoke from multiple industries in a large city