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GEOL107_08 - Geol107L08 oceans Sediment bottomofaliquid...

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Geol 107 L08 9/9/2011 1 What does this have to do with the oceans? Sediment Material that settles to the bottom of a liquid from the weathering of rock from the weathering of rock, carried and deposited by water/wind/ice or precipitated directly from the water How do we know about ocean sediments? younger Law of Superposition Younger material is deposited on top of older material. older Clastic v. chemical sediments Clastic: little bits of rock Terrigenous: material transported from continents …later in the semester Chemical: minerals precipitated from seawater 1. Abiotic (not shells) 2. Biotic (shells of organisms) today…. Abiotic v. Biotic Formation 1. Abiotic: chemically precipitated, without life e.g., manganese nodules 2 Biotic: biologically precipitated 2. Biotic: biologically precipitated i.e., shells of organisms
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Geol 107 L08 9/9/2011 2 Manganese Nodules Pacific Ocean 5300 meters depth Chemical Sediments 1. Abiotic: chemical precipitate 2. Biotic: biologically precipitated h ll f i i
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