Answers

2014-03-30T08:20:42+05:30
Small part of mountain are called hills and combination of hills is called mountain
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2014-04-01T17:24:40+05:30
A hill is a landform which has a distinct summit that extends above the surrounding terrain, in a limited area. 

A mountain is a landform that extends above the surrounding terrain in a limited area

 A mountain is generally higher and steeper than a hill, but there is considerable overlap, and usage often depends on local custom. 

 a hill is generally somewhat lower and less steep than a mountain.
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