Pollution is the introduction of harmful materials into the environment. ...
Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories.
Pollutants damage the quality of air …
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock.
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Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and …
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Pollution is the introduction of harmful materials into the environment. ...
Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories.
Pollutants damage the quality of air, water, and land.