Study the following statements with respect to coal 1 Coal is an igneous rock 2 Coal is a bio chemic...........

Geography Geomorphology

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Study the following statements with respect to coal:

1. Coal is an igneous rock.

2. Coal is a bio-chemical rock.

3. Coal is an organic rock.

4. Most of the world's coal was formed from vegetation in the Pleistocene epoch.

Which of the above is/are correct?

1 only

1&2 only

2&3 only

All the above

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Explanation:

Coal is a sedimentary rock and most of the world's coal was formed in the Carboniferous period.Apart from above mentioned it is of four types Peat,Lignite,Bituminous&Anthracite.
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.[1] Coal is formed if dead plant matter decays into peat and over millions of years the heat and pressure of deep burial converts the peat into coal.