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March 27, 2017

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A cobble-sized sediment is naturally broken off the steep sides of a valley in a mountainous region. The sediment falls onto a glacier that occupies much of the valley. Over several years, the sediment “falls through” the glacier and is then dragged along the glacier’s bottom. Next, the sediment is deposited in a pile of debris at the end of the glacier. A few years later, the sediment becomes part of a sand dune many miles from the glacier. The sediment is the transported to a stream from which, after a few months, it is deposited in a delta out in the ocean. Finally, the sediment becomes part of a child’s sand castle on a beach tens of miles from the delta.

1. What is the most likely shape of the sediment just after it fell onto the glacier? Why?

2. How can the sediment be considered a “tool” or aid to erosion while it is in the glacier and how could a landscape feature the sediment help create?

3. How the sediment would most likely end up in a sand dune due to natural processes?

4. Provide three reasons to explain why the stream would transport the sediment at varying speeds?

5. How the sediment could have naturally moved from the delta to the beach?

6. What evidence in the paragraph suggests that a human was an agent of erosion for the sediment?

7. What are five possible natural agents of erosion that could have been responsible for moving the sediment?

8. What are three likely changes in the appearance of sediment as it was transported from the valley wall to the beach, and what are the causes of the changes?

I REALLY NEED HELP WITH THESE QUESTIONS!!!My teacher haven't taught it in class yet. And I can't really find the information in text book.

Can anyone please give me some ideas to answer each of them?????
THANKS A LOT!!!!!!

  • Earth Sci - ,

    I am not a geologist!!!
    Now think about each step all by yourself:
    1. Big chunks of rock splitting off the cliff. Sharp edges where it split off and jagged shape.
    2. It scrapes the land under the ice as it is dragged along, creating grooves and scars in the earth and rock under.
    3. Ocean waves and freezing and thawing and ocean currents split it into tiny grains and spread it.
    4. Big pieces slow, small ones fast. dense rock slow. stream at various speeds.
    5. Waves and current
    6. The kid digging the sand up to build the castle.
    7. I guess you can come up with stuff like wind and waves and current
    8. Read all the steps above.

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