What is the snow line quizlet?
What is the snowline? the elevation above which snow persists throughout the year.
How would a snow line on a glacier move as a glacial front is advancing quizlet?
How would a snow line on a glacier move as a glacial front is advancing? The snow line would move downslope.
How would you expect the front of a glacier to move if it undergoes a period of net accumulation followed by net wastage and finally a period of net accumulation?
How would you expect the front of a glacier to move if it undergoes a period of net accumulation, followed by net wastage, and finally a period of net accumulation? The glacier's front would move forward, backward, and then forward again.
What type of glacial movement will be responsible for the greatest amount of glacial flow?
28 Cards in this Set
| Compared with the amount of ice that existed during the last glacial maximum, how much exists today? | 1/3 as much |
|---|---|
| Which type of glacial movement is circled | basal sliding |
| Which type of glacial movement will be responsible for the greatest amount of glacial flow? | Internal Flow |
What snow line means?
Scientific definitions for snow line snow line. The boundary marking the lowest altitude at which a given area, such as the top of a mountain, is always covered with snow. The boundary marking the furthest extent around the polar regions at which there is snow cover.
Why do glacial crevasses form quizlet?
when a valley glacier comes to a steep slope, cracks called crevasses form. They form because the ice near the surface of the glacier is rough and rigid. The ice responds to the movement of the ice underneath it by breaking.
What type of glacial depositional feature formed over time at the end of the glacier?
Any such accumulation of till melted out directly from the glacier or piled into a ridge by the glacier is a moraine.
Which process occurs where a glacier enters the sea?
Calving. The process by which pieces of ice break away from the terminus of a glacier that ends in a body of water or from the edge of a floating ice shelf that ends in the ocean. Once they enter the water, the pieces are called icebergs.
How do glaciers flow?
Glaciers move by internal deformation of the ice, and by sliding over the rocks and sediments at the base. Internal deformation occurs when the weight and mass of a glacier causes it to spread out due to gravity. Sliding occurs when the glacier slides on a thin layer of water at the bottom of the glacier.
What is glacial movement?
A glacier might look like a solid block of ice, but it is actually moving very slowly. The glacier moves because pressure from the weight of the overlying ice causes it to deform and flow. Meltwater at the bottom of the glacier helps it to glide over the landscape.
What causes glacial movement?
The sheer weight of a thick layer of ice, or the force of gravity on the ice mass, causes glaciers to flow very slowly. Ice is a soft material, in comparison to rock, and is much more easily deformed by this relentless pressure of its own weight.
What is snow line class 9?
Class 9thTamilnadu – Social Science Term-12. Lithosphere – II Exogenetic Processes. Answer : Snowline is the line demarcating between the snow-covered and snow-free areas. It is the line up to which the level of snow extends given a particular point of time.
What is the snow line called?
The boundary between the accumulation zone and the ablation zone on glaciers is called the "annual snow line". The glacier region below this snow line was subject to melting in the previous season. The term "orographic snow line" is used to describe the snow boundary on surfaces other than glaciers.
What is a glacial crevasse quizlet?
Glacial Crevasses. A crevasse is a deep crack, or fracture, found in an ice sheet or glacier, as opposed to a crevice that forms in rock.
Where do crevasses form in glaciers?
Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle. Below that, a glacier is less brittle and can slide over uneven surfaces without cracking. The inflexible upper portion may split as it moves over the changing landscape.
What is glacial deposition called?
Debris in the glacial environment may be deposited directly by the ice (till) or, after reworking, by meltwater streams (outwash). The resulting deposits are termed glacial drift.
What is the zone above the snow line on a glacier called?
What is the zone above the snowline of a glacier called? Antartica.
What is glacier water called?
Meltwater is water released by the melting of snow or ice, including glacial ice, tabular icebergs and ice shelves over oceans. Meltwater is often found in the ablation zone of glaciers, where the rate of snow cover is reducing.
What is it called when glaciers move?
Glacial motion is the motion of glaciers, which can be likened to of rivers of ice. It has played an important role in sculpting many landscapes. Most lakes in the world occupy basins scoured out by glaciers.
What do glaciers do?
Glaciers not only transport material as they move, but they also sculpt and carve away the land beneath them. A glacier's weight, combined with its gradual movement, can drastically reshape the landscape over hundreds or even thousands of years.
Where do glaciers move?
Moving forward Under the pressure of its own weight and the forces of gravity, a glacier will begin to move, or flow, outwards and downwards. Valley glaciers flow down valleys, and continental ice sheets flow outward in all directions.
How glaciers are formed?
Glaciers form on land, and they are made up of fallen snow that gets compressed into ice over many centuries. They move slowly downward from the pull of gravity. Most of the world's glaciers exist in the polar regions, in areas like Greenland, the Canadian Arctic, and Antarctica.
Why do glaciers flow?
The sheer weight of a thick layer of ice, or the force of gravity on the ice mass, causes glaciers to flow very slowly. Ice is a soft material, in comparison to rock, and is much more easily deformed by this relentless pressure of its own weight.
What is glacier flow?
In simple terms, for a glacier to maintain a state of equilibrium, glacier flow is required to balance inputs and outputs to the system. Glacier motion facilitates the transfer of ice from the accumulation zone (where mass gain is dominant) to the ablation zone (where mass loss is dominant).
What is called snow line?
The climatic snow line is the boundary between a snow-covered and snow-free surface. The actual snow line may adjust seasonally, and be either significantly higher in elevation, or lower. The permanent snow line is the level above which snow will lie all year.
What is snow line class 7?
Snow line can be defined as an altitude above which snow presence is seen throughout the year. Snow is never melted at this range. At or near the equator, it is typically at approximately 4,500 meters. In Himalayas the permanent snow line can be as high as 5,700 metres.
What is the snow line of a mountain?
The snowline is the line (as in a point of elevation on a mountain) at which the amount of snow falling equals the amount of snow melting in the summer. If the climate cools enough, so that snowlines are lowered, glaciers develop in mountains, and ice sheets will develop in mid-latitudes.
How are glacial crevasses formed?
Crevasses also form when different parts of a glacier move at different speeds. When traveling down a valley, for example, a glacier moves faster in the middle. The sides of a glacier are slowed down as they scrape against valley walls. As the sections advance at different speeds, crevasses open in the ice.
What is a glacial trough in geography?
Glacial troughs, or glaciated valleys, are long, U-shaped valleys that were carved out by glaciers that have since receded or disappeared. Troughs tend to have flat valley floors and steep, straight sides.
Which of the following best describes glacial deposition?
Which of the following best describes glacial deposition? The settling of sediments left behind by a moving glacier.