Sedimentary__Weathering_Notes.pptx - Sedimentary Rocks Weathering Notes Sedimentary Rocks \u2022 Formed from weathering erosion and deposition of existing

Sedimentary__Weathering_Notes.pptx - Sedimentary Rocks...

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Sedimentary Rocks & Weathering Notes
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Sedimentary Rocks Formed from weathering, erosion and deposition of existing rocks.
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Weathering & The Creation of sediments Begin with a parent rock of any type and then go through: 1. Weathering – physically or chemically breaking the rock down into small fragments 2. Erosion – moves sediment from one place to another place 3. Deposition – sediment settles in a new location. You now have a sediment!
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Compaction and Cementation Sedimentary Rocks can form from compaction and/or cementation. Compaction – adding pressure to squeeze particles together. Cementation – “gluing” together of sediments from water solutions.
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Sediments…. Are deposited in layers and compacted & cemented to make a sedimentary rock Often have a “layered” look Stratification – the process by which sedimentary rocks are arranged in layers Often record ripple marks, mud crack, and fossil
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What is Weathering The process that breaks down rocks and other substances at Earth’s surface. Heat, cold, water and ice all contribute to weathering. Two Types of Weathering: Chemical Weathering Mechanical/Physical Weather Mechanical Weathering Mechanical weathering breaks rock s into pieces by freezing and thawing, release of pressure, growth of plants, actions of animals, and abrasion
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Organic Activity ROOTS of trees and other plants enter cracks in rocks. As the roots grow, they force the cracks apart. Overtime the roots of even small plants pry apart cracked rocks. Insects, earthworms, and burrowing animals often disrupt soil layers, exposing parts of bedrock to weathering .
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Gravity… The force that moves rock and other material downhill. Gravity causes mass movement, any one of several processes that moves sediment downhill.
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  • Spring '09
  • RobertKirshner
  • clastic sedimentary rocks,  Example

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