Coal is formed as a result of coalification of remains of plants. Which of the following factors favor this process?
A
Presence of air
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B
Absence of air
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C
Low temperature
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D
High temperature
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Solution
The correct options are B Absence of air D High temperature Coalification is a process where the remains of plants are subjected to high temperature and pressure in the absence of air. These conditions chemically transform the plant remains into coal.