what is topsoil? what is made up of
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top soil is the uppermost layer of soil. It has the highest concentration of organic matter. topsoil is composed of mineral particles, organic matter, water and air.
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The topsoil layer is a mixture of sand, silt, clay and broken down organic matter, called humus. Humus is rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects and twigs. ... The topsoil is relatively thin but it has most of the soil's nutrients.
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