Trench collapses usually involve large areas of falling dirt that weigh approximately 100 lb per cubic foot.Thus the correct option is B.
When the walls of a trench are unable to bear the weight of the tonnes of soil pressing against them, the trench will collapse. This could be a concern at any level, it might get worse if additional materials are added up along the edge.
Trench collapses usually involve large areas of falling dirt that weigh approximately 100 lb per cubic foot.To stop trenches from collapsing under the added weight Deploy additional mining supplies at least 2 feet from the trench.
Therefore, option B 100 lb is appropriate.
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Trench collapses usually involve large areas of falling dirt that weigh approximately _______ per cubic foot.
A. 50 lb
B. 100 lb
C. 200 lb
D. 150 lb
