What Is Thunder and Lightning?
Lightning is a sudden, violent flash of electricity between
a cloud and the ground, or from cloud to cloud. A lightning fl ash, or bolt,
can be several miles long. It is so hot, with an average temperature of 34,000°
Centigrade, that the air around it suddenly expands with a loud blast. This is
the thunder we hear.
Lightning
occurs in hot, wet storms. Moist air is driven up to a great height. It forms a
type of cloud called cumulonimbus. When the cloud rises high enough, the
moisture freezes and ice crystals and snowfl akes are formed. These begin to
fall, turning to rain on the way down. This rain meets more moist air rising,
and it is the friction between them which produces static electricity. When a
cloud is fully charged with this electricity, it discharges it as a lightning
flash.
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