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Answer:
b. the porous and permeable, saturated cone of depression in an aquitard.
Explanation:
An aquifer is an underground layer of water, surrounded by a porous, and saturated layer of water bearing rock. The aquifer is lined by a layer of bed of low permeability along its length. This layer is called an aquitard, and it usually forms a depression.
"Erratics" are large rocks that are not the same as the rock types found in the area and are deposited by the glaciers as they move or melt.
<h3>What are erratics?</h3>
Stones and rocks that were carried by a glacier and then abandoned after the glacier melted are known as glacial erratics.
Some characteristics of erratics are-
- The bedrock where the glacial erratic is deposited has a distinct lithology from the sort of rock that makes up the glacier erratic.
- A sandstone boulder moved by a glacier and placed on top of limestone bedrock would be an example of an erratic.
- Scientists can identify and locate the source outcrop of some erratics because they are made of a particular type of distinguishable rock.
- In order to recreate historical glacier flow directions, the timing of glacier retreat, and even the type of glacier flow, it is helpful to analyze glacial erratics.
- Large boulders, tiny stones, and pebbles can all be erratic. Every erratic is made of a unique sort of rock.
To know more about the formation of erratics, here
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