Soil liquefaction describes a phenomenon whereby a saturated or partially saturated substantially loses strength and stiffness in response to an applied stress, usually earthquake shaking or other sudden change in stress condition, causing it to behave like a liquid.
Those geographic helped to protect the Roman Empire.
The answer is D. The Ganges is too polluted (bathing, burial, travel) to actually drink from. The Indians think of the Ganges of a religious river, therefore scattering the ashes of their dead ones and bathing the worshippers in the water.
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New Zealand and the outback