2025年1月10日 · This article covers the structure, composition, and classification of soils and how these factors affect soil’s role in the global ecosystem. In addition, the two most important phenomena that degrade soils, erosion and pollution, are discussed.

2025年1月10日 · Soil - Structure, Composition, Properties: The grain size of soil particles and the aggregate structures they form affect the ability of a soil to transport and retain water, air, and nutrients.

2025年1月10日 · The evolution of soils and their properties is called soil formation, and pedologists have identified five fundamental soil formation processes that influence soil properties. These five “state factors” are parent material, topography, climate, organisms, and …

2025年1月10日 · Soil - Nutrients, pH, Minerals: The bulk of soil consists of mineral particles that are composed of arrays of silicate ions (SiO44−) combined with various positively charged metal ions. It is the number and type of the metal ions present that determine the particular mineral.

The bulk of soil consists of mineral particles composed of silicate ions combined with various metal ions. Organic soil content consists of undecomposed or partially decomposed biomass as well as humus, an array of organic compounds derived from broken down biomass.

2025年1月14日 · Chemical element - Soil Composition, Properties, Reactions: Soil is a thin veneer that forms a discontinuous cover on the land areas of the Earth. Its volume and its mass are small in comparison to the major geospheres, but it is of vast importance to man.

2025年1月10日 · Soil - Texture, Structure, Composition: The two principal systems of soil classification in use today are the soil order system of the U.S. Soil Taxonomy and the soil group system, published as the World Reference Base for Soil Resources, developed by the Food and Agriculture Organization (FAO) of the United Nations.

2024年12月24日 · One or more horizons make up what is known as the soil profile, the vertical sequence of distinct layers that is unique to each soil type. For general descriptive purposes, soil horizons are commonly given abbreviated designations based on their location in the soil profile and on their composition.

2025年1月25日 · Moon - Rocks, Soil, Craters: As noted above, the lunar regolith comprises rock fragments in a continuous distribution of particle sizes. It includes a fine fraction—dirtlike in character—that, for convenience, is called soil.

Soil is a mixture of minerals and organic material that covers much of Earth’s surface. Minerals are bits of rock, and organic material is the remains of living things that have died. Soil is not as solid as rock. It has many small spaces, called pores, that hold water and air.