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one ton equals one cubic meter of soil was 100mm deep it would cover 7sqm
A circle comprises 360 degrees. So, a fourth of a circle is 360/4 = 90 degrees.
Technically, none. A square foot is a measure of area whereas it is the volume of water that is required. To convert from area to volume it is necessary to know the depth. A twelfth of a cubic foot will cover an area of one square foot to a depth of 1 inch. A cubic foot will cover it to a depth of 1 foot, 100 cubic feet will cover it to a depth of 100 feet.
Cloud cover can be expressed in "octals" - a rating out of 8 based on how much cloud is covering the sky. One eighth of coverage is called an octal.
That's going to depend on how deep or shallow you spread it. If you spread it one foot deep, it covers an area of 2 square feet. If you spread it one inch deep, it covers an area of 24 square feet.