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Ice Wedging: Weathering Process Breaking Rocks Apart

Ice wedging, also known as frost wedging, is a physical weathering process where water seeps into cracks, freezes, and expands to break rocks apart. Learn about the difference between weathering and transport and explore the formation of sandstone using sodium silicate as a matrix. Examine your model sandstone and compare it to Coconino Sandstone to record similarities and differences.

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Ice Wedging: Weathering Process Breaking Rocks Apart

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  1. Day 19 What is ice wedging (or frost wedging)? Ice wedging is a physical weathering process. It happens when water seeps into cracks, then freezes and expands, pushing outward and breaking the rock apart. What is the difference between weathering and transport? Weathering is when rocks break apart. Transport is when rock pieces are carried from one place to another. Daily Warm-Up Exercises 1

  2. Make Sandstone(Part 5) Investigation 4 My Sediments Exactly

  3. Compare Sand & Sandstone What's the same about sand and sandstone? They're both made up of small particles of rock. What's different about them? The sandstone is glued together. The sand is loose. 3

  4. Matrix The material that glues the sand together in sandstone is called a matrix. A matrix is a chemical that glues a rock together. Several materials can act as the matrix in sandstone. Today, you will make sandstone using a matrix called sodium silicate. 4

  5. Sodium Silicate Silicate minerals are found in many kinds of rocks. These minerals may be chemically weathered & dissolved in water. Our solution is a mixture of sodium silicate and water. similar to the the solution found in nature

  6. Basin In the stream table, what happened to the eroded material? The water carried it downhill and deposited it in a lower area. Low areas are called basins. You will use a plastic container as your model basin. Follow the recipe on page 33 to make sandstone.

  7. Compare Model to Reality Where would we find large collections of sand? beaches, sand dunes How could sodium silicate get between the sand grains? Water with a lot of dissolved sodium silicate could seep into the sand. 7

  8. Sequence of Events Just after deposition, sand is loosely packed (lots of space) Sand is compacted over an extended period of time (very little space) Water carrying dissolved matrix seeps into the sand Sand is cemented together by matrix as water evaporates

  9. Questions How can acid or water soak into sandstone? There are spaces between grains that can hold liquid. What type of rock is sandstone? sedimentary 9

  10. Examine & Compare Use a hand lens to examine your model sandstone. Compare your model to Coconino Sandstone. Record similarities and differences. Think about: the origin of the sand the matrix that holds the sandstone together the size and compactness of the sand grains evidence for your conclusions

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