About 300 million years ago the earth had dense ____a____ in low lying wetland areas. Due to natural processes, like ___b___, these forests got buried under the soil. As more ___c_____ deposited over them, they were compressed. The ___d_____ also rose as they
sank deeper and deeper. Under high temperature and high ____e____, dead plants got slowly converted into coal. This slow process of conversion of dead vegetation is called ____f_____.
Only give the answer for blank 'd'
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a. vegetation.
b. earthquake.
c. surface layer.
d. pressure.
e. pressure.
f. carbonization.
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