Exercise 11. Match a line in A with a line in В to make a sentence

A	В
Billions of tons of solid waste	May have far-reaching consequences.
A typical American	Refers to illness resulting from job- related exposures.
Waste from developed countries	Exists in many forms.
Areas where wastes are buried	Are called landfills.
Hazardous wastes	Are kept in storage facilities.
Legal regulations restrict	How such materials may be used or disposed.
Pollution	Has a dramatic effect on natural resources.
Environmental contamination	Contains a high percentage of synthetic materials.
Occupational disease	Generates an average of four pounds of solid waste each day.
Pollution	Are thrown out annually.

Exercise 12. Read the text. Fill in the gaps with one of the words from the box.

Rain, pollution, silt, logged, fields, aquatic, eliminate, streams, salmon

Erosion, the wearing away of topsoil by wind and, also

Contributes to water. Soil and__ (a fine sediment) washed from

___ hillsides, flowed_. or construction sites, can clog waterways

And kill___ vegetation. Even small amounts of silt can desirable

Fish species. For example, when logging removes the protective plant cover

From hillsides, rain may wash soil and silt into, covering the gravel

Beds that trout or use for spawning.