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A 'mountain range' is a chain of mountains bordered by lowlands or separated from other mountain ranges by passes or rivers. Individual mountains within the same mountain range do not necessarily have the same geology; they may be a mix of different orogeny, for example volcanoes, uplifted mountains or fold mountains and may, therefore, be of different rock. The Andes is the world's longest mountain range. The Himalaya contains the world's highest mountains.

Contents

Tectonic plate movement

Volcanic action

Erosion

Climate

Ecology

See also

Tectonic plate movement

A range of mountains (often elongated) may be caused by tectonic plate interactions. For example, the Himalaya in Asia are the result of the Indian plate hitting the Eurasian plate, causing a 'crumple zone' near the line of impact. Sometimes, one tectonic plate can become pushed beneath another. The top plate scrapes off the material which builds up to form mountains, this happens over millions of years. Volcanoes can arise for this reason. An example is Vesuvius.

Volcanic action

Singular mountains are often the result of volcanic processes but, in some instances such as the Hawaiian Islands, these processes can result in a chain of mountains that might be considered a mountain range.

Erosion

Uplifted regions or volcanic caps can undergo erosion, resulting in a range of mountains. An example is the English Lake District. Mountain streams carry eroded debris downhill and deposit it in alluvial plains or in deltas. This forms the classical geological chain of events, leading to one type of sedimentary rock formation: erosion, transportation, deposition and compaction.

Climate

The position of mountains influences climate, such as rainfall. When wind moves over the sea, the warm moist air rises and cools to form orographic rainfall, while cool dry air moves over the ridge to the leeward side.
Their location also affects temperature. If the sun is shining from the east, then the eastern side of the mountain will receive sunlight and warmth, while the other side will be shaded and cooled, so certain ecosystems maintain different biological clocks depending on the location of a mountain.

Ecology

Mountain ranges can support different terrestrial biomes, at varying altitudes: at the bottom, they may have grassland, then a coniferous forest or boreal forest, then tundra at the top.

See also

★ List of mountain ranges

★ List of mountains

★ Appalachian Trail by state