Mountain range
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A mountain range (Sierra in the Spanish language) is a group of mountains bordered by lowlands or separated from other mountain ranges by passes or rivers. Mountains of the same mountain range do not necessarily have the same geology; they may be a mix of volcanoes and uplifted mountains.
The geological definition of a mountain range (also cordillera or sierra) is a grouping of mountains (often elongated) sometimes caused by tectonic plate interactions. For example, the Himalaya in Asia are the result of the India plate hitting the Asian plate.
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.
Mountain ranges can have different terrestrial biomes: at the bottom, they may have grasslands, then a coniferous forest or boreal forest, then a tundra at the top.
Some mountain ranges are called fold mountains. These mountain ranges were formed by one tectonic plates getting pushed beneath another. The top plate scrapes of the material which builds up to form mountains, this happens over millions of years
The Andes is the world's longest mountain range.
Streams flow down a mountain and turn into rivers that turn into sea's.