Report
Social function: to describe the way things are, with reference to
a range of natural,man-made and social phenomena in our environment.
Generic structure:
General classification: introducing the thing that will be talked about.
Description: elaborating and reporting on the subject in detail.
What Are Thunder and Lightning?
Lightning is a sudden,
violent flash of electricity between a cloud and the
ground, or from cloud to cloud. A lightning flash, or bolt, can be severalmiles
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 snowflakes 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.
Taken from Peter Haddock Ltd., Ref.083
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