<span>Sinkholes, especially like the one that occurred in Mexico City, are often sign that the water reservoir is being depleted. Usually, the water underneath the ground helps stabilize it, however if there is suddenly open space or a cavern, it can collapse on its self causing a sink hole. This could also happen from fracking and drilling.</span>
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I would measure the scope to see how long, wide it is
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Shield this is the answer
Answer: Tin, gold, copper, nickel, coal, petroleum are major natural resources in Southeast Asia.
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