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Porto Nacional | |
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Population | 46598 |
Porto Nacional is a Brazilian municipality in the state of Tocantins. The population was 45,289 (2007) in an area of 4,450 km2 (1,720 sq mi), including both rural and urban areas.
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A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. A mountain differs from a plateau in having a limited summit area, and is larger than a hill, typically rising at least 300 metres (1000 feet) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges.Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, and through erosion by rivers and glaciers.