Week 8: Geodes, Weathering, and Erosion

 


  1. What did you do in lab today?

    1. Today in lab, we investigated sand. We looked at its characteristics and where we thought it came from.

    2. Characteristics of sand:

      1. Sand #1

        1. Size: small 

        2. Shape: smoother edges 

        3. Color: looks gold/yellow and clear  

      2. Sand #2

        1. Size: smaller than the first one 

        2. Shape: looks like Pop Rocks or Nerds

        3. Color: orange and yellow

      3. Sand #3

        1. Size: 

        2. Shape: 

        3. Color: black and shiny 

      4. Sand #4

        1. Size: big and small chunks 

        2. Shape:

        3. Color: white and clear  with black specks 

      5. Sand #5 

        1. Size: 

        2. Shape:

        3. Color: lots of colors, pink and clear and blue and red 

      6. Sand #6 

        1. Size: all similar in size 

        2. Shape:

        3. Color: yellowy/clearish

      7. Sand #7

        1. Size: varying in size 

        2. Shape: 

        3. Color: looks like rocks with mixed colors 

      8. Sand #8 

        1. Size: 

        2. Shape:

        3. Color: orange, clear, yellowy 

      9. Sand #11 

        1. Size: 

        2. Shape: round/circleish, smooth 

        3. Color: white/cream 

  2. What was the big question?

    1. Where does sand come from? 

  3. What did you learn in Thursday’s discussion?

    1. During the Devonian period in Iowa was mostly submerged under warm, shallow inland sea 

    2. Sand created through water: polished, smooth, and generally similar in size

    3. Sand created through glaciers: polished, smooth, irregular in size

    4. Sand created through wind: opaque, frosted, pitted (dented), and very fine-grained 

    5. Igneous → Sedimentary → Metamorphic 

      1. All can melt, weather and erode, and heat and pressure 

    6. Law of Superposition

      1. Older layers are on the bottom, younger layers on top 

  4. Read chapter 8 of the online textbook.

    1. What did you learn?

      1. Sand that is formed from weathering by wind tends to be pitted and frosted in appearance because other grains of sand have constantly been pelted against the rock. Sand that is formed from weathering by water tends to be smooth and polished because the water has continuously passed over the rock. 

    2. What was the most helpful?

      1. I found this whole chapter to be helpful as a refresher on what we learned in lab, but also as a way to gain some more information and cool facts. 

    3. What do you need more information on?

      1. I do not need any more information on anything. 

  5. What questions, concerns, and/or comments do you have? 

    1. I do not have any questions, concerns, and/or comments after lab and lecture this week.


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