Question

Why are industries located in specific areas

Answer 1

industries are located in specific areas as to meet cost expenses, easy availability of raw materials, access to markets, availability of power etc .
these features help the industries to develop in short expenses .

Answer 2

there are some special criterion for the setting up of industries like
market
raw materials
land
availability of labour etc
the place fulfilling these are the place where industries are set up and these places are often called MIDCs.
thus to fulfill these criteria the industries are set up where these criteria are fulfilled..