18B. Chemical WeatheringProcess by which rocks and minerals undergo changes in their compositionCan cause some substances to dissolveSome new minerals formNew minerals have properties different than those of original rock
24Oxidation of the iron in the rock causes a red hue
25Acid precipitation (rain): sulfur dioxide, carbon dioxide and nitrogen oxides released into atmosphere by human activities; gases combine with oxygen and water to form strong acid rainsPlant acids: from decaying plants
44This means that rocks can weather at different rates! marbleslate
45D. TopographyHigher elevation = faster weathering (colder, more ice wedging)Steep slopes - gravity pulls rocks down hill
46III. Weathering and Soil Soil: loose rock fragments and clay from weathered rock mixed with organic material.
47A. Soil Composition A = Humus - dark organic material B & C = Soil – mixture of minerals, gases, and dead organismsD = Regolith – layer of weathered rock fragmentsE = Bedrock – solid unweathered rock
48B. Soil Profile Soil Profile: cross section of the soil layers Horizons: layers in the soil