Excess nutrients from fertilizers or sewage can enter a pond and result in an increase in the population of algae. When the algae die, bacteria use oxygen to break down the algae. This can cause the dissolved oxygen concentration in the pond to decrease. What might happen as a result of low dissolved oxygen concentrations in a pond?

• The pond will have an overabundance of fish.

• Fish and other organisms could die.

• The pond will become crystal clear.

• Sediment will clog up the pond.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A city increases the amount of groundwater pumped from its aquifers to support its growing population, but the water level of the aquifers drops. Which of the following is NOT a possible consequence of these actions?

• the aquifer could go dry

• eutrophication

• restricted water use goes into effect

• lower lake and stream levels

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Analyze the following photo of permeable pavement.

How does this type of walkway benefit groundwater and surface water in a watershed?

• It allows surface water to become runoff.

• It keeps water from soaking into the ground.

• 
  It prevents groundwater pollution.

• 
  It allows precipitation to soak into the ground.

Tags

NGSS.MS-ESS2-4

What is a potential environmental impact of using excessive fertilizers in agriculture?

• Improved water quality

• Water pollution due to runoff

• Reduction in crop yield

• Increased soil fertility

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Most of the world's water is...

• freshwater

• saltwater