T3+notes

T3+notes - Rocks, Minerals and Parent Materials (Topic #3)...

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Rocks, Minerals and Parent Materials (Topic #3) Parent material : The material from which a soil forms. Rocks (or decomposed and transported pieces of rock) are the parent material from which most soils form (inorganic or mineral materials). Organic materials may also be considered a parent material ( e.g., peat bogs). Some geological considerations 1. Rocks are a collection of minerals 2. Minerals are made up of a few elements arranged in a specific pattern Three types of rocks: 1. Igneous - rocks formed when hot liquid magma cools and solidifies - Extrusive = fast cooling at the earth's surface (small crystals) - Intrusive = slow cooling below the earth's surface (large crystals) Intrusive/Extrusive a. Granite/Rhyolite High silicon & potassium (Light colored) b. Diorite/Andesite Intermediate composition and color c. Gabbro/Basalt High iron, magnesium & calcium (Dark colored) Rock type chemistry and mineralogy determines the kinds and amounts of nutrient elements released ( i.e., soil fertility) and secondary (clay) minerals that will form over time. 2.
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T3+notes - Rocks, Minerals and Parent Materials (Topic #3)...

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