The
atmosphere is a band of gases—mostly nitrogen, oxygen, and argon—held
around Earth by gravity. Air masses, each defined by fairly uniform
temperature and humidity, move around the atmosphere. The interaction of
air masses creates all the conditions that make up the weather—from
clear, sunny skies to hurricanes and torrential rain. The pattern of
weather over time in a particular region is called the climate. In some
parts of the world, extreme weather conditions are part of the climate.
In other places, the climate is less extreme, so people are totally
unprepared when a weather disaster strikes.
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