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That depends on how thin you spread it. If it's a meter thick, it only covers one square meter. If it's a centimeter thick, it covers a hundred square meters.
30 metres square = 900 square metres 6 inches = 0.1524 metres. So amount of soil required = 900*0.1524 = 137.16 cubic metres
None, since a square is a two dimensional shape.
to what depth???
3.7