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Electrons greatly contribute to the mass of the atom.

Ionic bonds form when atoms share 2 or more electrons.

The daily mean temperature is determined by ________.

Climates where evaporation exceeds precipitation are called ________ climates.

A cT air mass is and .

The hydrosphere refers to the ________ that exist at Earth’s surface.

Thunder is produced by ________.

An air mass that forms in the North Atlantic Ocean in winter over cold water and then comes ashore is a ________ mass.

The most studied and well-documented urban climatic effect is the urban ________.

As a result of global warming, ________ is expected during the next century.