how is soil formed? what is the function of humus?
Answers
The outermost layer of our earth is called the crust and the minerals found in this layer supply a variety of nutrients to life's form. But these minerals will not be available to the organisms if the minerals are bounded up in huge rocks . over long periods of time thousands and millions of years, The Rocks at or near the surface of the earth are broken down by various physical ,chemical and some biological process the end product of this breaking down is the fine particles of soil.
Humus is a major factor in deciding the soil structure because it cause the soil to become more porous and allows water and air to penetrate deep underground .The mineral nutrients that are found in the particles soil depend on the rocks it was formed from.
Soil is the thin layer of material covering the earth's surface and is formed from the weathering of rocks. It is made up mainly of mineral particles, organic materials, air, water and living organisms—all of which interact slowly yet constantly.it is also used to describe a topsoil horizon that contains organic matter (humus type, humus form, humus profile). Humus is the dark organic matter that forms in soil when dead plant and animal matter decays. Humus has many nutrients that improve the health of soil, nitrogen being the most important.