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Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from soil by restricting the former term specifically to displaced soil.
Soil is loose stuff which lies on top of the land. It has many things in it, like tiny bits of rock, minerals, water and air. Soil also has living things and dead things, called organic matter. Soil is important for life on Earth because soil holds water and nutrients. It is a very good place for plants to grow.
The physical properties of soil, in order of decreasing importance for ecosystem services such as crop production, are texture, structure, bulk density, porosity, consistency, temperature, colour and resistivity.
May 1, 2024 · Soil is one of the principal substrata of life on Earth, serving as a reservoir of water and nutrients, as a medium for the filtration and breakdown of injurious wastes, and as a participant in the cycling of carbon and other elements through the global ecosystem.
Soil science is the study of soil as a natural resource on the surface of the Earth including soil formation, classification and mapping; physical, chemical, biological, and fertility properties of soils; and these properties in relation to the use and management of soils.
Soil biology is the study of microbial and faunal activity and ecology in soil. Soil life, soil biota, soil fauna, or edaphon is a collective term that encompasses all organisms that spend a significant portion of their life cycle within a soil profile, or at the soil-litter interface.
A soil horizon is a layer parallel to the soil surface whose physical, chemical and biological characteristics differ from the layers above and beneath. Horizons are defined in many cases by obvious physical features, mainly colour and texture.
Soil classification is a dynamic subject, from the structure of the system, to the definitions of classes, to the application in the field. Soil classification can be approached from the perspective of soil as a material and soil as a resource.
A soil type is a taxonomic unit in soil science. All soils that share a certain set of well-defined properties form a distinctive soil type. [1] Soil type is a technical term of soil classification, the science that deals with the systematic categorization of soils.
Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal detritus at various stages of decomposition, cells and tissues of soil microbes, and substances that soil microbes synthesize. SOM provides numerous benefits to the physical and chemical properties of soil and its capacity to provide regulatory ...
Oct 19, 2023 · Soil composition is a mix of soil ingredients that varies from place to place. The Natural Resources Conservation Service (NRCS)—part of the U.S. Department of Agriculture—has compiled soil maps and data for 95 percent of the United States.
In short, soil is a mixture of minerals, dead and living organisms (organic materials), air, and water. These four ingredients react with one another in amazing ways, making soil one of our planet’s most dynamic and important natural resources. Soil is used by people in numerous ways.
Map of global soil regions from the USDA. Soil science deals with soil as a natural resource on the surface of the earth. It includes soil formation, classification and mapping.
Soil is the biologically active and porous medium that has developed in the uppermost layer of Earth’s crust. It serves as the reservoir of water and nutrients and a medium for the filtration and breakdown of injurious wastes.
Soils perform vital functions to sustain plant and animal life, regulate water flow, filter and buffer pollutants, cycle nutrients, and provide physical stability and sort. This definition is from the Soil Science Society of America.
Soil is sometimes referred to as the ‘skin of the earth’. Soils develop over time under the influence of chemical, physical and biological processes. They develop where rocks and sediments (lithosphere) are influenced by flora and fauna (biosphere), water (hydrosphere) and climate (atmosphere).
Where does soil come from? - BBC Science Focus Magazine
Lunar soil is the fine fraction of lunar regolith found on the surface of the Moon and in the Moon's tenuous atmosphere. Lunar soil differs in its origin and properties significantly from terrestrial soil . As the Moon's fine surface layer, lunar soil is picked up by even weak natural phenomena active at the Moon's surface, allowing it to be ...
Loam. Three layers of subsurface loam; surface layer is dark brown fine sandy loam, subsurface layer is pale brown fine sandy loam, subsoil is red clay loam and sandy clay loam. Loam is soil made mostly of sand and silt: By weight, it is about 40–40–20% concentration of sand–silt–clay, respectively. [1]
Mar 25, 2022 · What is Soil? Composition of Soil. Physical & Chemical Properties of Soil. Types of Soil- Sandy, Clay, Silt and Loam Soil. Functions of Soil.
5 days ago · soil (countable and uncountable, plural soils) ( uncountable ) A mixture of mineral particles and organic material, used to support plant growth. We bought a bag of soil for the houseplants.
Dec 26, 2022 · English: Soil is a natural body consisting of layers of mineral constituents of variable thicknesses, which differ from the parent materials in their morphological, physical, chemical, and mineralogical characteristics
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