Which source of water pollution includes oil and gasoline discharge from automobiles and storm sewer drainage?

Which best explains the importance of dissolved gases in the ocean?

Which best describes a bioindicator?

How can the atmosphere be considered part of the hydrosphere?

What characteristic of aluminum allows it to be made into aluminum foil?

Which pure substance is composed of more than one element?

Which factor best explains why some people will develop cancer and others will not after being exposed to the same high levels of a harmful chemical?

Which is the best way to determine if an object is made of pure silver?

A layer of marine fossils is discovered in a desert environment. Which hypothesis best explains the discovery?

Fossils of warm-weather plants were found on an island in the Arctic Ocean. What can best be concluded from this discovery?

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