Answer:
A. are brought from the mantle to the surface in magma that hardens into kimberlite
Explanation:
Diamonds are brought to the surface from the mantle in a magma that is known as the kimberlite. This kimberlites is rich in gases and it is an igneous rock that has the following minerals,olivine, phlogophite, serpentine etc.
The origination of diamonds in the mantle happens as carbon transformation occurs due to heat and pressure occurs. The kimberlite pipes and what brings the diamonds to the surface
This process where the sheets might peel off like an onion is called exfoliation.
Rock exfoliation can be described as a process that occurs causing sheets of rocks to be peeled from the surface of a rock. The process is also describes as Onion skin weathering.
Pressure release that happens during erosion could also be responsible for this happening. Curved plates of rocks would be stripped from underneath.
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True, for example the Pacific Ring of Fire is where majority of volcanic activity happens. The Pacific Ring of Fire sits along western North America...this is because of its plate boundaries.
