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What generates the heat is not the speed of the air, but the friction of the air moving against an object. Same principle as rubbing your hands together, only with air. So as long as the walls of the wind tunnel whatever happens to be in it are sufficiently low in friction then, no it won't generate a fireball.
As far as your original question though, yes you could melt a rock with air if you got the air moving fast enough and the rock was rough enough.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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