WED & Watershed Review

Which of the following is NOT a source of pollution in the ocean?

• Fertilizers used on land.

• Sand drifting along the bottom of the ocean floor.

• Oils found on city streets.

• Emissions from gas-burning vehicles.

What happens when a fertilizer runoff happens?

• Fish get bigger.

• Algae grow rapidly.

• The water becomes very clear.

The largest source of pollution in the ocean comes from __________.

• Runoff

• Acid Rain

• Wind

If gasoline or oil or trash goes into a storm drain in the street, it goes directly...

• to the sewage treatment plant
• into the stream
• to groundwater
• none of the above

When fertilizers enter surface water, they cause problems in 
the watershed by -

• increasing the amount of nutrients available to fish in lakes and streams.
• 
  clogging narrow streams and preventing water from flowing properly.
• raising the water level in nearby rivers to levels leading to flooding.
• causing rapid algal growth that decrease oxygen levels and choke aquatic life.

Why is gravity a factor in watersheds? 

• it causes the water to flow away from a watershed
• it causes the water to flow down towards a watershed

A student sets up the investigation shown below.

The movement of colored water through the gravel best models —

• condensation of water vapor

• surface runoff of precipitation

• conservation of water

• pollution of groundwater

A student drew the model below to represent a part of a watershed and some human activities that affect the watershed.

How do the industrial, agricultural, and residential activities of humans most likely affect the groundwater in the area

• The activities prevent most of the water from evaporating into the atmosphere.

• Pollutants from the activities percolate through the soil and enter the water table.

• The activities replace the groundwater used.

• All of the above

Overflow during a heavy rainstorm from a wastewater treatment plant would result in –

• polluted runoff into nearby ponds.

• flooding in the local aquifer.

• weakened housing foundations.

• over-treated drinking water.

Runoff from agricultural land carries chemicals from fertilizers that collect in a lake. The buildup of chemicals can eventually cause--

• aquatic life, such as fish and turtles, to die from lack of oxygen

• excess water to fill the aquifer

• river tributaries to reroute, changing the flow of waterways

• rainfall levels to drop