GeographyCoal is a black ____ rock, which is also the backbone of the iron and steel industry.

Coal is a black ____ rock, which is also the backbone of the iron and steel industry.


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    Solution:

    Coal is a black sedimentary rock, the backbone of the iron and steel industry.
    Coal is assessed as a non-renewable energy source because it takes several millennia to create. Coal contains the stored energy of plants that lived in wetland forests years ago. Coal is carbon, with other things infused, such as nitrogen and sulfur.
     
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