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Glaciers
Glaciers are large, dynamic bodies of ice that form over long periods of time when snow accumulation exceeds ice ablation. They are among the most significant forces shaping Earth's landscape over long time scales. Glaciers are currently found at Earth's poles and in mid-latitude and equatorial mountains.
1,124 Questions
How does glacier erosion affect the earth?
Glaciers have a high albedo: they reflect more of the Sun's light/heat back into space than bare soil. So their general effect would be cooling: the more glaciers, the larger the cooling effect.
What do glaciers do o a land as they move across it?
it gives it waay more room!!
no the glaciers moves across the land under it's own weight and the this causes rocks to push up to causes little mounds the more this happens the little ditch that was created gets deeper and it gets wider that also why there are inland lakes
both of you are wrong, they transport material as they move and they also scuplt and carve away the land beneath them!! simfene Williams love You all
ok all three of you are wrong. 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, the ice totally changes the landscape. The ice erodes the land surface and carries the broken rocks and soil debris far from their original places, resulting in some interesting glacial landforms.
Was there ever a glacier in New York?
no but it did to long island new york and cape cod and minnisota.
What is large ice mass that moves slowly down a mountain across land is called?
It is a glacier. As more snow and ice is added at the top, in the mountains, so the extra weight helps to push the front of the glacier downhill.
In which direction to valley glaciers move?
Valley glaciers flow down mountain slopes... so they flow down. I finally found this answer in a book.
Is it normal for ice glaciers to melt?
Almost all glaciers in the world, including those on continental ice sheets, ice shelves, and mountains in the tropics, mid- and high-latitudes, are retreating. This is documented by different types of remote sensors both on satellites and in planes, as well as many, many teams of scientists who actually go up to these glaciers with instruments to monitor them.
For more information, even a source such as Wikipedia is very good on topics like this because it's so highly moderated, unlike this site. If you want to read the papers themselves, the magnates include Lonny Thompson at OSU (the leading expert on tropical glaciers) and his wife Ellen Moseley-Thompson (expert on Greenland) as well as Eric Rignot and really anyone at UC Boulder and Ohio State where they pioneer this stuff. And be wary of anyone who makes claims counter to this published research, because it's fringe or just junk science.
Snow falls on the mountains and it builds up there. When the weight becomes too heavy it begins to flow down the mountain like a river. They don't flow in any specific direction.
Is evidence of the past existence of glaciers?
U-shaped valleys, erratic boulders and rocks, modern soils, glacial striations on bedrock, the Great Lakes in the United States, extinction events, and massive redistribution of soils and rock.
Why do glaciers affect the land?
by moving along the ground
answ2
1. At their head catchment area, the glacier will collect the annual snow fall, and commence to move it downwards. This process opens up cracks (bergschrunds) between the snow and the rock, for the rock will be warmer than the snow. (heat from the interior) Into these crevices, sometimes many feet wide, rocks will fall from the mountain above, and water will flow off the day-warmed rocks.
2. In the main long body of the glacier there will be occasional steps in the valley bedrock, and there will be steps where a minor glacier branch joins a larger glacier. At these step points, a crevassed ice-fall will form, and again any moraine debris from the surface will become entrained in the ice.
These entrained rocks and debris will be ground along the bedrock by the motion of the glacier, and produce a very fine rock flour in the process.
Thus at the base of the glacier, we have water from melt, boulders and debris, and rock flour. These will be all ground along by the glacier above. Small and medium boulders will be ground to a rounded form, larger boulders will have their sharper corners ground off, but at any time, much of their body will be embedded in the glacial ice, and they will rotate only slowly. As these are dragged across the bedrock, they will produce the striae - the glacial scratches and gouges in the bedrock.
3. Upvalley from the snout of the glacier, is the ablation (wastage) zone, where some of the ice mass will sublimate directly to water vapour, and much will melt. Near the snout, the glacier may be completely covered by rock moraine, and kettle holes will form due to uneven melting. Immediately downvalley of the glacier, a melt lake may form, and this feature is very destructive of the remaining ice. When masses of ice fall into the melt lake, minor tsunami (but ten metres or so high) may be created and these are dangerous to humans.
A glacier can move rock from the mountains to the plains hundreds of times faster than simple riverine processes will do.
Unlike a river, glacial ice can extend far below the surface level, and (where I live) glacial lakes 300m above sea level have their depth up to 100m below sea level.
A fiord glacier may have its bed several hundreds of metres below sea level, the ice breaking off where the fiord enters the sea, and the ice becomes buoyant; and depositing a mound of moraine at the mouth of the fiord.
What is the movement of a glacier?
As a glacier moves through a valley, it digs deep into the walls and floor . A once-narrow valley that had a V shape becomes wider. As a glacier moves through, the valley becomes U shape .
What percentage of water is ice caps and glaciers?
All the great rivers of Asia are fed by glacial melt and about 40% of the world relies on these rivers for drinking and other uses.
What do glaciers leave behind as they leave?
They leave behind cold water.
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They also leave behind to rock and soil that they have pushed forward, known as morraine.
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In what manner do glaciers move?
A glacier flows by the force of gravity pulling it downhill and spreading it out.
Sometimes this process causes cracks to form as the ice spreads faster on the outside than on the inside as gravity pulls on it, creating crevasses
Why cant people drink the water from glaciers?
They would slip and float away.
Another Answer
People can walk on glaciers wearing ice crampons, so that they do not slip and float away.
What is the term for glacier sediment?
The rock and soil debris accompanying the glacier is moraine. lateral moraine at the sides where avalanches have dropped it, terminal moraine where the glacier finishes, and medial moraine formed from the lateral moraines of two contributory glaciers when they join.
What happens to a glacier when they get very heavy?
The density of ice at 0°C is 0.9167 g/cm³. The density increases slightly at lower temperatures.
Therefore, the volume and temperature of the glacier is needed in order to calculate the exact weight.
What causes motion of glacier?
gravity. And the fact that ice behaves in a plastic (ductile, not brittle) fashion
Glaciers are formed when snow accumliates over a long period of time, often in a hollow. As the snow builds up the pressure builds up causing the snow to compact so much it is turned to ice.
The ice only becomes a glacier when it starts to move, usually this movement is due to gravity.
There are two types of glacier, valley glaciers and ice sheets. As you can imagine valley glaciers are formed in valleys where a river has frozen. These can often lead to the formation of ribbon lakes, hanging valleys, U-shaped valleys and truncated spurs.
Ice sheets are simpley large glaciers that can be anywhere, some are small, others are the soze of continents. As they move they can cause plucking and abrasion. As well as this they can cause corries and drumlins, amongst other things.
What are 2 ways glaciers erode the land?
The two processes are abrasion and plucking.
What processes lead to glacial erosion? Describe them.
The two main processes that lead to glacial erosion are plucking and abrasion. Plucking is the process by which a glacier picks off rocks as it blocks over the land. The rock fragments freeze to the bottom of the glacier, gouging and scratching the bedrock as the glacier advances in the process of abrasion.
How are glaciers and Icebergs alike?
A glacier is a frozen river, which forms in freezing conditions high up in mountains. As it reaches lower altitudes, it may melt. However, in some parts of the world, especially in Greenland and in Antarctica, the air is so cold that the glacier can reach the sea and remain frozen. When this happens, the glacier pushes the frozen water out into the ocean. Eventually, under the influence of wave action or internal stresses, a lump of ice breaks off. This process is known as calving. The lump of ice is now free to float away. It is called an iceberg.
How many meters deep is the Lambert Glacier?
According to its Wikipedia entry:
"Lambert Glacier is a major glacier in East Antarctica. At about 60 miles wide, over 250 miles long, and about 2,500 m deep, it holds the Guinness world record for the world's largest glacier."
