Lignite
lignite
lignite
lignite
Lignite is the softest form of coal.
Lignite
Lignite
lignite
lignite
lignite
Lignite is the softest form of coal.
Lignite is the youngest and softest coal; bituminous is mid-grade coal, and anthracite is the hardest and hottest burning coal. Even brown coal.
Lignite The softest of this family is not much more concentrated than peat and has about 4000btu/lb.
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sandstone
Type your answer here... aravindhan
It is scientifically proven that Dubai Desert sand is the softest sand on earth with the smoothest most curved sand particles ever.