Week 8: Geodes, Weathering, and Erosion

Week 8: Geodes, Weathering, and Erosion

1. What did you do in lab today? In lab this week we did an investigation on various different sands from beaches, rivers, and deserts. As table groups we were able to use a digital microscope and look closely at the colors and shapes of the small particles. Following this investigation we then did a quick trip to the measum in Macbride Hall. 

2. What was the big question? The big question was where does sand come from. We explore the answer to this question through our investigation of the various sands we were given. There were guesses made that I included below!

  1. Looks like little rocks; Maybe from a river

  2. Dessert vibes; reddish coloring

  3. Black, shiny, green, grey; Volcanic sand

  4. Chrysally; White and shiny; White sand beach

  5. Cave or Cove; red, green, white

  6. Corn vibes; yellow; dessert or river sand

  7. Jungle or river; red, green, clear

  8. River; Orange, red, white

  9. Coal; White, black, green

  10. White, orange, yellow; river 

  11. Desert; White chocolate covered raisins

3. What did you learn in Thursdays lecture? In Thursdays lecture I learned about the Law of Superposition. This was a new term/concept for me or I haven't ever paid attention when this was being taught. Sedimentary rocks form layers that become bared under more layers as time goes on. The layers on top are younger and the layers at the bottom are older.

Textbook:

1. What did you learn? I learned that not far from Iowa City is the Devonian Fossil Gorge. High flood waters in 1993 revealed the gorge with lots of fossils. This time was apart of the Devonian period approximately 375 million years ago. 

2. What was the most helpful? I found the image for Laws of Superposition helpful just as another way to explain the layers. The most clarifying part was part E where a shift had occurred due to the plate tectonics.

3. What did you need more information on? I would like to look at more photos/graphics of the Law of Superposition where there is intrusions of magma that go through the horizontal layers beneath the surface. 

1. What questions, comments, and/or concerns do you have? None currently.

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