The most common elements in the Earth’s crust are rarely found on their own. They are usually found combined. Suggest why this is.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

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How does carbon monoxide pose the greatest threat to humans? a. it can be produced by wood fires. b. it can be produced by home furnaces. c. it is produced by acid rain. d. it is produced by modern automobiles.