The diagram of the earth show the 4 layers. The layer that is made of plastic nature is crust which is Layer C. Hence option C is correct.
What is a plastic layer?
The plastic layer is one that is composed of plastic-like materials. The asthenosphere is called a plastic layer, and forms the upper mantel zone.
This layer is where the tectonic plates move inwards and get subducted. The earth is highly fluid and vicious at this point as this layer is about 200 km in length.
Find out more information about the plastic layer.
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