How are mountains different form hills?

Answer 1

A mountain is generally steeper than a hill. Unfortunately, there is no universally accepted standard definition for the height of a mountain or a hill although a mountain usually has an iidentifiable summit. In the United Kingdom, a mountain must be over 600 meters or 300 meters if it's an abrupt difference in the local topography. However, some hills can be called mountains and some mountains can be called hills--it's just a matter of the original name given to the relief.

Answer 2

These terms aren't strictly defined. Mountains are usually higher than hills, but nothing stops local people from calling any large hill a mountain.

Michigan's Porcupine Mountains, for example, are considered a joke by many people for their highest peak is less than 2,000 feet high.

Check this article for more information.

http://en.wikipedia.org/wiki/Mountain