1.

Which of the following process represents coalification?(0) Sinking of trees and plants into swamps.(ii) Formation of spongy dense material from dead and decayingplants.(iii) Gradual changes in the physical and chemical properties of coalin response to temperature, pressure, and time.(iv)Accumulation of dead trees and plants layer upon layer beneaththe earth's surface.​

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ANSWER:

the answer is 3 it is RIGHT



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