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Evidence a region was (or just as importantly, was not) covered by glaciers usually comes in the form of such glacial features as
- moraines
- cirques
- "erratics" (rocks moved from one place to another)
- glacial tarns
- most especially wide, U-shaped valleys with stepped stream gradients
- deep coastal fjords
- absence of deep sediment and short distance to bedrock
The reason Siberia, Manchuria, central and northern Alaska, and also the Patagonian steppes, were not glaciated during the Quaternary is simply that they were too dry. Except for the Patagonian steppes, all these regions are even today cold enough for glaciers, but so little snow fell and falls that even with much reduced ablation glaciers cannot develop. (For instance, Barrow receives only 29 inches of snow whereas glaciated Nunavik receives over 100.)
In hot regions, soils are so weathered it clear that glaciers could never have formed since the Carboniferous even if there is no deep sedimentation.
What else can I help you with?
A geologist finds deep gouges and scratches on bedrock in an area once covered by a glacier These scratches are evidence of the type of erosion called?
These scratches are evidence of glacial erosion, specifically caused by the movement of rocks embedded in the ice as the glacier advances and retreats. This type of erosion, known as abrasion, leaves distinct marks on the bedrock in the form of gouges and scratches.
How are glacial grooves made?
Glacial grooves are created when rocks embedded in the base of a glacier scrape the underlying bedrock as the glacier moves. The immense pressure and friction exerted by the moving glacier cause the rocks to plow into the bedrock, leaving long, parallel grooves behind. These grooves are a common feature in areas that were once covered by glaciers during the last ice age.
Glacier formed long smooth hills?
These long smooth hills are known as drumlins, which are created by the movement of glaciers during the process of glaciation. As a glacier advances, it reshapes the landscape by depositing and sculpting materials, forming these distinctive elongated landforms. Drumlins are typically found in regions that were once covered by ice sheets during the last Ice Age.
How is a drumlin made?
A drumlin is a long mound of glacial till that is formed by the movement of a glacier. As the glacier moves, it picks up sediments and deposits them in an elongated shape with a rounded end facing the direction of ice flow. Drumlins are typically found in regions that were once covered by ice sheets during the last Ice Age.
Is it true that due to the force of friction a glacier will start to move downhill once the layer of snow and ice is more than about 30 to 40 meters deep?
Yes, the force of friction between the glacier and the ground is one of the factors that allows glaciers to move downhill under their own weight. This movement occurs once the thickness of the glacier reaches a critical depth where the force of gravity overcomes the frictional resistance. Once this threshold is reached, the glacier will start to flow downslope.
What is an evidence that an area was once covered by a glacier?
loess deposits
What is evidence that a glacier once covered an area?
u shaped valleys
What conclusion do geographers draw when they observe moraines-ridgelikes piles of rock and debris?
A glacier once covered the area. THIS IS TRUE.GRADPOINT/NOVANET :) ;)
What conclusions do geographers draw when they observe moraines?
A glacier once covered the area.
What is evidence that an area was once covered by glaciers?
loess deposits
What conclusion do geographers draw when they observe piles of rock and debris?
A glacier once covered the area. THIS IS TRUE.GRADPOINT/NOVANET :) ;)
What conclusion do geographers draw when they observe moraines- ridgelike pile of rock and debris?
A glacier once covered the area. THIS IS TRUE.GRADPOINT/NOVANET :) ;)
A geologist finds deep gouges and scratches on bedrock in an area once covered by a glacier These scratches are evidence of the type of erosion called?
These scratches are evidence of glacial erosion, specifically caused by the movement of rocks embedded in the ice as the glacier advances and retreats. This type of erosion, known as abrasion, leaves distinct marks on the bedrock in the form of gouges and scratches.
What is an area that was once covered by an area?
loess deposits
How does glacial debris end up at the bottom of a glacier?
Glacial debris gets incorporated into the glacier as it flows over the landscape, picking up rocks, sediment, and other materials. These materials are then transported within the glacier towards its base due to the movement of the ice. Once the glacier reaches a warmer area or melts, the debris is deposited on the ground or in bodies of water, leaving behind evidence of the glacier's path.
What happens to a land mass previously covered in glacier ice once the ice melts?
It usually rises, without the weight of the ice.
What was the population after the eruption of pompeii?
If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.If you mean the population around Pompeii after the eruption, it was 0. The entire place was covered in pumice and ash and once the looters were finished the area was abandoned.
