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Mountain range

geography Maturity 7-9 Next article →

A mountain range is a series of mountains or hills arranged in a line. These peaks are connected by high ground. When a group of ranges shares a similar form, structure, and alignment, they are called a mountain system or a mountain belt. These systems usually arise from the same cause, which is often an orogeny. An orogeny is a process that builds mountains. Most significant mountain ranges on Earth result from plate tectonics.

Apollo 9 image of the Namcha Barwa Himal range, AS09-23-3511
Apollo 9 image of the Namcha Barwa Himal range, AS09-23-3511

Mountain ranges are formed through many different geological processes. They are not always made of the same materials. Individual mountains within one range might have different geologic structures. They can also have different petrology, which is the study of rock types. A single range might contain a mix of different features. These can include thrust sheets, uplifted blocks, fold mountains, and volcanic landforms. This variety means that different rock types can exist side by side.

Large mountain ranges have a massive impact on the climate. This happens because of how they interact with air masses. When air moves up and over a mountain, the air cools. This cooling produces orographic precipitation, which is rain or snow. As the air descends on the leeward side, it warms up again. This warming follows the adiabatic lapse rate. The air on this side is much drier because it has lost its moisture. This often creates a rain shadow on the leeward side. Large ranges like the Andes can divide a continent into distinct climate regions.

Erosion is a constant force that works to tear mountain ranges down. This process happens even while the mountains are being uplifted. Rivers are believed to be the main cause of this erosion. They cut into the bedrock and transport sediment. Sediment is the material that is carried away. These sediments often fill nearby basins. Over time, these materials can be buried and turned into sedimentary rock. In the Rocky Mountains, erosion removed Mesozoic sedimentary strata from the core. This material spread as sand and clays across the Great Plains. This removal of weight may have caused further uplift through isostatic adjustment.

World Distribution of Mid-Oceanic Ridges
World Distribution of Mid-Oceanic Ridges

Many famous mountain systems exist on Earth. The Andes in South America is a very long system. It is often called the world's longest mountain system on the land surface. The Alpide belt is another massive system. It stretches 15,000 km across southern Eurasia. This belt goes from Java in Southeast Asia to the Iberian Peninsula in Europe. It includes the Himalayas, the Karakoram, and the Alps. The Himalayas contain the highest mountains, such as Mount Everest.

If we include underwater mountains, the scale of mountain systems changes. The Ocean Ridge is the world's longest continuous mountain system. It is a massive chain located on the ocean floor.

World Distribution of Mid-Oceanic Ridges
World Distribution of Mid-Oceanic Ridges

Other important ranges include the Appalachians and the Great Dividing Range. The Pacific Ring of Fire also contains many young ranges. This includes the North American Cordillera and the Aleutian Range. These ranges are part of a larger, active geological system.

We can also find mountains on other objects in our Solar System. On the Moon, mountains like the Montes Apenninus often form from impact events. These are caused by objects hitting the surface. Some terrestrial planets have rocky ranges too. On Venus, Maxwell Montes is taller than any mountain on Earth. On Mars, there are the Tartarus Montes. Some moons have mountains made of ice instead of rock. Saturn's moon Titan has the Mithrim Montes. Pluto has the Tenzing Montes. Even Jupiter's moon Io has ranges formed by tectonic processes.

Montes Apenninus AS15-M-1423
Montes Apenninus AS15-M-1423
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🖼️ Images & Media (4)
File:Apollo 9 image of the Namcha Barwa Himal range, AS09-23-3511.jpg
Apollo 9 image of the Namcha Barwa Himal...
File:World Distribution of Mid-Oceanic Ridges.gif
World Distribution of Mid-Oceanic Ridges.gif
File:Andes 70.30345W 42.99203S.jpg
Andes 70.30345W 42.99203S.jpg
File:Montes_Apenninus_AS15-M-1423.jpg
Montes_Apenninus_AS15-M-1423.jpg
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