bulldozer or dozer (also called a crawler)
is a large, motorized machine equipped with a metal blade to the front for
pushing material: soil, sand, snow, rubble, or rock during construction work.
It travels most commonly on continuous tracks, though specialized models riding
on large off-road tires are also produced. Its most popular accessory is a
ripper, a large hook-like device mounted singly or in multiples in the rear to
loosen dense materials.
Bulldozers are used heavily in large and
small scale construction, road building, minings and quarrying, on farms, in
heavy industry factories, and in military applications in both peace and
wartime.
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