The composition of the components inside soil varies to create different soil types. It is the seat of soil fertility. The clay fraction, because of its high surface area, is the most active part of the soil controlling many of the chemical and physical properties of the soil. 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. 3. Its upper limit is air or shallow water and its lower limit is the depth to which soil weathering has been effective. Soil composition is a mix of soil ingredients that varies from place to place. Soil is constantly being formed wherever bedrock is exposed. Transcript Soil Formation and Composition PPT Soil Formation and Composition Soil Formation 1. Air and water occupy the pore spaces in soils. SOIL Soil Taxonomy definition: Collection of natural bodies of the earth’s surface, in places modified or even made by man or earthy materials, containing living matter and supporting or capable of supporting plants out of doors. Soil is the outer, loose layer that covers the surface of Earth. Discuss erosion. A soil profile is the sequence of natural layers, or horizons, in a soil. Soil profile. Discussing how soil is formed and why it is important to look after it. Find answers to questions on the web. The chemical composition of the soil, the topography, and the presence of living organisms determines the quality of soil. In general, soil contains 40-45% inorganic matter, 5% organic matter, 25% water, and 25% air. Pore spaces are the voids between the soil particles. Each soil series consists of soils having major horizons that are similar in color, texture, structure, reaction, consistency, mineral and chemical composition, and arrangement in the soil profile. 1.2. Critical soil functions include the ability to support plant growth and productivity, nutrient cycling, and water partitioning. 2. Suitable for Y3 pupils. Soil forms as rock is broken down by weathering and mixes with other materials on the surface. Composition of Soil Soils have four major components: (a) mineral matter, (b) organic matter, (c) air, and (d) water. Look at and draw a soil profile. In order to sustain plant life, the proper mix of air, water, minerals, and organic material is required. The sand and silt fractions i influence mainly the physical properties of the soil. Soil that is classified as clay, for example, contains more water than light, sandy soils. Fig. Soil is the loose, weathered material on Earth's surface in which plants can grow. Plants obtain inorganic elements from the soil, which serves as a natural medium for land plants. Soil Quality is defined as the soil’s capacity to function. Closely observe a soil sample and record what is found. 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