GEOG 203 : mid 2.pdf
19 Nov 2014
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Weathering: endogenic: internal in earth, exogenic: external to earth, oxygen and silicon make up 75% of earth"s crust. Therefore crust is made up of majority silicates. There are also oxides, sulphides and sulphates and carbonates: mineral: inorganic natural compound possessing a crystalline structure. Igneous: solidified and crystallized from molten state (magma) intruding into rocks or extruding onto surface (lava). Intrusive rocks cooling slowly in crust are plutons. Batholith: large pluton, making up several mountain chains. Plutons cutting through layers of rock vertically are dikes and horizontally are sills. Categorized into felsic (light in color, less dense, low melting point) like granite, rhyolite, pumice and obsidian; and. Mafic (opposite) like basalt (cooled extrusive lava): metamorphic: hard, weather-resistant rocks formed through intense pressure and heat. Occurs along tectonic ridges, at bottom layers of sediment, and in rocks adjacent to magma. sedimentary: driven by solar energy and gravity.
