EESA01H3 Lecture : Week 7

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Mineral matter with varying proportions of organic matter has much influence on surrounding ecosystems leaching/soil creation: occurs in warmer/wetter climates- faster chemical reactions and heat. Parent material: base geological material in a particular location can include lava, volcanic ash, rock sediment deposits by glaciers and rivers. Bedrock: continuous mass of solid rock that makes up the earths crust. Weathering: physical/chemical/biological pressure that breaks down rocks and minerals, turning large particles into smaller particles. Physical weathering/mechanical: breaks down rocks without trigerring chemical change in parent material. Chemical weathering: when water or other substances chemically react with parent material. Biological weathering: when living things break down parent material by physical or chemical means. Erosion: the movement of soil from one area to another. Humus: a dark spongey crumbly mass of material made up of complex organic compounds. Peat: soils that are dominated by partially decayed compressed organic matter (characteristic of northern climates)

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