Dolerite is a Igneous (hypabyssal) rock and rest are sedimentary rocks.
Neeraj Kumar said:
(Feb 25, 2017)
Dolerite is igneous rock.
Adnan Guru said:
(Apr 30, 2017)
Why not lignite?
Vasantha Devi said:
(May 30, 2017)
Lignite, often referred to as brown coal, is a soft brown combustible sedimentary rock formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content. It has a carbon content around 60-70 percent. So dolerite is correct answer.
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