The two tectonic plates meet at point one. One is moving under the other, shown by the two arrows on the top pointing towards each other. The denser plate (left side) is subducted. This means the denser plate begins to go under the less dense plate. The lithosphere (crust/tectonic plate) is mainly solid rock. As it begins to go into the mantle it will begin to heat up as the mantle is hotter than the surface. The solid surface becomes a molten rock, known as magma. It melts as it goes down.
"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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