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The general rule is that the rock can't get hot. When you heat the rock, the water inside evaporates and can crack the rock. If you're just making fire to warm yourself or cook something (a steak, ...
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The general rule is that the rock can't get hot. When you heat the rock, the water inside evaporates and can crack the rock. If you're just making fire to warm yourself or cook something (a steak, ...