LOW pressure system
Warmth of Earth's surafce heats the air above.
Air begins to rise, which means less pressure on the earthe below.
As air rises it cools in the upper atmosphere and condeses forming clouds.
Regular areas with low pressure usually receive lots of annual rainfall.
HIGH pressure system
Cool air sinks back down to the Earth.
High pressure is formed
Regular areas with high pressure are ARID areas
Receive low annual rainfall.
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