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Earth revolves around the larger sun in a __________.

The four major depth zones are:

What happens to waves as they approach shore?

The density of air ______ as you move to higher altitudes in the atmosphere.

Lightning forms when:

What was the source of the gases that composed the early atmosphere on Earth?

___________ air pressures are found in cold regions, ___________ air pressures are found in tropical warm environments.

The concentration of atmospheric oxygen and the evolution of Earth’s biosphere are ______.

A rapid increase in density with depth is a ______.

_________ is the only substance that exists in all three states on Earth’s surface.