Aniline Dyes. A class of synthetic, organic dyes originally obtained from aniline (coal tars),and were the first synthetic dyes. Today the term is used with reference to any synthetic organic dyes and pigments, in contrast to animal or vegetable coloring materials, and synthetic inorganic pigments.
From Wikipedia, the free encyclopedia. Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by soil organisms.he concentration of SOM in soils generally ranges from 1% to 6% of the total topsoil mass for most upland soils. Soils whose upper horizons consist of less than 1% organic matter are mostly limited to desert areas, while the SOM content of soils in low-lying, wet areas can be as high as 90%.
Soil is another of Earth's materials. Soil is a mixture of decomposed organic matter and broken down rocks and minerals. The decomposed organic matter is mainly dead plant material. The broken down rocks and minerals are formed when larger rocks and minerals are made into smaller pieces due to erosion or weathering. On average, soil is made up of 45% rock and mineral pieces, 5% decomposed organic matter, and 50% pore space.