GEOL107-Notes - GEOL-107 How does knowledge of igneous...

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GEOL-107 8/27/08 – How does knowledge of igneous rocks help us understand prehistoric life? Temperature, age, region 1) Determining the age of bones by determine the age of the rock around it a) Rock – i) Aggregate (group) of minerals (type of composition) ii) Must be crystalline solid – atoms are regularly arranged (1) Crystal faces (flat) i.e. Quartz (2) Cleavage (peeling) i.e. Mica iii) Occur naturally iv) Element or chemical compound b) Video i) Igneous rocks (1) Cool slowly – turn into [large] crystals (regular patterns) i.e. plutonic (2) Cool quickly – turn into [large and small] glass (unordered) i.e. obsidian (3) Does not heat up – turn into [small] rocks ii) Sedimentary rocks (1) Eventually settle in horizontal layers
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11/10/08 1) Absolute dating – determine the age of rocks in years a) Trees have annual layers (growth->compact->repeat) b) Varves (annual layers of sediment) found in glacial lake c) Radioactive decay and Radiometric dating i) Discovered by Henri Becquerel d) Spontaneous chance e) Independent of environment f)
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