Watersheds

Humans affect watersheds and wetlands by :

• spraying fertilizers and pesticides

• destroying habitats

• building many roads and parking lots

• all of the above

A ___________________ is the area of land that collects runoff and channels it into a main river.

• ridgeline

• estuary

• river system

• watershed

Where is water most likely to become contaminated?

• in a forest

• near a large farm

• at the top of the mountain

• at the bottom of the ocean

Which of the following is an example of how humans can reduce the rate of natural erosion?

• plow cropland
• clear land of trees to build
• plant trees
• logging

What is erosion?

• When rocks and sand are moved by water
• When water gets contaminated
• When plants grow next to a river
• When rocks are broken apart by water

Which of the following can pollute water?

• Moss
• Pesticides
• Seaweed
• Fish

The use of pesticides and fertilizers must be 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 chemicals 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.

Waste from animals can contaminate water.

• True
• False

We all live in a watershed.

• True
• False

Water flows uphill.

• True
• False