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Excavating an acre of soil to the depth of three feet will give you 4, 840 cubic yards of soil, which will require approximately 400 dump truck journeys.
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Its deadliness was linked, among other things, to the weakness of buildings, the depth of the quake, the density of population, the fault and soil types, and the intensity of the shaking.
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It is true, they say, that tree roots can trap sliding soil but only for shallow landslides of up to a metre in depth.
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