A mountain is an elevated portion of the surface of a planet, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain is usually considered higher than a hill, typically rising 300 metres (980 ft) above the surrounding land. It may either have a limited summit area or be a smaller plateau with high elevation and steep sides. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosio...
