valley glaciers
valley glaciers
Glaciers grind into mountains by eroding the cirques at their heads. If a mountain has cirques all around it, the glaciers may carve it into a tall, faceted remnant called a horn. This example in the Juneau Icefield of southeastern Alaska displays two cirques, and there must be one or two more on the back side. On the left side is an arête.
cirques
Ussually by three cirques A cirque is an origin point for glaciers in mountainous areas. It is a deep depression with three high walls and an open area from which the glacier moves forward, down the mountain side. Over time, as rock is eroded, these become wider and deeper. A mountain horn, such as the Matterhorn in the Alps forms when a peak is surrounded on two or more sides by cirques. As the cirques expand and rock is eroded the peak is honed into a point, forming a horn.
Ice aprons are small accumulations of snow and ice that reside on the side of mountains. They are also called hanging glaciers.
cirques I believe
Mountains can block the flow of atmospheric moisture causing rain to fall on the windward side of the mountains. The leeward side is left dray forming a rain shadow desert. See the image above.
The Atlas Mountains in North Africa can create a rain shadow effect. As moist air moves from the Mediterranean Sea towards the mountains, it is forced to rise, cool, and release moisture on the windward side. This can result in dry conditions on the leeward side of the mountains, leading to a rain shadow effect.
I believe Cirques are a bowl-shaped basin resulting from glacial erosion on the side of the mountain.
I believe Cirques are a bowl-shaped basin resulting from glacial erosion on the side of the mountain.
The atmospheric flow in this area of South America is from the east, from the Atlantic Ocean. Any moisture would be forced to drop as rain or snow on the eastern slopes of the Andes Mountains and nothing would fall on the western, or Atacama side, so no glaciers could form. The same lack of moisture is what causes the Atacama Desert.
A lowland between mountains is known as a valley. Valleys are typically formed by the gradual erosion of the land by rivers or glaciers, creating a flat or gently sloping area surrounded by higher elevation on either side. They are often fertile areas due to the accumulation of sediment and nutrients carried down from the mountains.