The residue of coal decomposition that is used in the manufacture of steel is called coal gascokecoal tar

The correct answer for the question that is being presented above is this one: "coke." The residue of coal decomposition that is used in the manufacture of steel is called coke tar. The coke tar is mostly the waste after the coal decomposition that is used in steel manufacturing.

No, because you are more likely to see volcanic mountains where magma is rising along the mid-ocean ridge spreading to the center.