The breakdown of a material by a physical means is ____.

Ice wedging occurs when....

Which is NOT an example of abrasion?

A breakdown of a material by a chemical means is ____.

Which of the following is NEVER a catalyst of chemical weathering?

Air pollution can increase the acidity of rain and snow. When this rain or snow falls, it is called ___.

What is one thing humans can do to decrease air pollution?

A chemical reaction in which a substance combines with oxygen to create an oxide, such as rust, is called ____.

Where do small rocks on the ground come from?

Roots of plants may cause...

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