How doelectric field lines indicate the strength of the fielt?
by how long the lines are
by how else the lines are
by the direction the lines are pointing
by showing the charge that creates the lines
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a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..