Watershed

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.

Pollutants from a factory enter a stream or creek and travel to a river. River water tested with the pollutant found is called  

• point source pollution
  Available space for crops
• nonpoint source pollution.
• eutrophic pollution
• riparian pollution

The use of pesticides and herbicides is carefully monitored 
because of the effect they can have on the environment.
Which of the following is a possible negative effect of the use 
of these chemical on the environment?

• Runoff carries these chemicals into lakes and streams.
• Theses chemicals cannot be purchased in large bulk.
• 
  These chemicals are expensive to produce.
  
• Storage space for these chemicals is limited.

The illustration provided shows a river and four cities on that river. When the water from the river was sampled at location X, it was determined to be polluted with various chemicals. What would be the most likely source for this pollution?

• City 1 and City 2
• City 2 and City 3
• City 3 and City 4
• City 1 and City 4

A industrial powerplant dumps its heated wastewater straight from a pipe into a stream. This is an example of -

• eutrophic pollution
  over-treated drinking water.
• riparian pollution
  flooding in the local aquifer.
• point source pollution.
• nonpointsource pollution.

What is a watershed?

• Land that collects and channels water froma small body of water to a larger body of water
• The shape of the land determined by elevation
• A natural stream of water of considerable  volume
• A river and all its tributaries

Why is gravity a factor in watersheds? 

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

What is topography?

• a graph showing all the different topos
• A map of all the waterways in an area
• A map of different mountains in a mountain range that share watersheds
• The shape of the land determined by the elevation

What is a divide?

• a natural stream of water of considerable volume
• a continuous ridge that separates one watershed from another
• small rivers or streams that flow into a larger river or stream
• a body of fresh water found in low lying areas

Define tributaries

• small rivers or streams that flow into a large river or stream
• a natural stream of water of considerable volume
• precipitation that flows over the land to streams
• a continuous ridge that separates a watershed