Week 7: Rocks and the Rock Cycle

 Week 7: Rocks and the Rock Cycle 

1. What did you do in the lab today? 

N/A; I was absent from the lab. 

2. What was the big question? 

How do rocks change and form through the rock cycle? 

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

In this week's discussion, we talked about density. We started by talking about the density of soda cans and how sugar is denser. We tested this by comparing regular sodas with diet or sugar-free sodas. The sugar-free sodas would float because they were less dense. After we talked about gold and how they actually add silver to gold. We were trying to figure out how much silver was in a gold crown. Using water, we placed each item and measured the amount of water that spilled out to determine whether silver had been added. Lastly, we opened up a geode to see how hollow it is on the inside. We divided the rock's weight by its weight when it's in water. Then Ted cracked open the geode to see if it was hollow or not. 

4. Read the online textbook chapter 2: 

    • What did you learn?
      • Igneous
        • Formed when magma cools 
        • First type of rock 
        • Can undergo: 
          • Heat and pressure are required to become metamorphic
          • Weathering and erosion to become sedimentary 
          • Melting and magma go back to igneous 
      • Sedimentary 
        • Formed when small particles called sediments are compacted together over time
        • Fossils are always found in sedimentary rocks 
      • Metamorphic 
        • Formed when existing rocks undergo extreme heat and pressure
        • Metamorphic means to change shape
      • Rock cycle: 
        • Key processes are weather and erosion, and heat and pressure. 
        • Each rock undergoes different changes.
      • Geodes
        • When a cavity forms in a rock
          • This occurs when a bubble of carbon dioxide and water vapor forms in flowing lava. As the rock cools and gas dissolves, the empty space is left behind. 
          • It can also form in a sedimentary rock like limestone or sandstone
            • Happens when decomposition occurs 
      • Archimedes' principle: 
        • Says that the weight of the displaced liquid is equal to the weight of the object. 
        • A geode that is less dense will have more crystals inside
    • What was most helpful? 
    The table was most helpful, breaking down each rock type and describing its characteristics. 
    • What do you need more information on?
    I would like to know more about how the rocks are changing into different ones. It would be beneficial to see videos or images. 

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

    No questions. 

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