about what percent of the Earth's surface is covered by soil?
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A typical soil is about 50% solids (45% mineral and 5% organic matter), and 50% voids (or pores) of which half is occupied by water and half by gas.
OR
Only about 7.5% of the Earth's surface provides the agricultural soil on which we depend for the world's food supply (Table 1.1), and this fragment competes, sometimes unsuccessfully, with all other needs: housing, cities, schools, hospitals, shopping centres, land fills, etc.
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7.5% is answer I am 99% sure
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