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  1. #1
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    Dec 2008
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    Default as it runs down, recedes

    Hi,

    I was wondering if someone could take a look for me at these two questions.

    Thanks for your help.


    The professor is discussing rock formations.

    ... ...
    On a mesa, condition are optimal for erosion. With enough time, even the durable top of a mesa will decrease in size. The sides of a mesa are often made of shale or softer sandstone. The slope of the sides will increase the water's speed and force as it runs down.( Does it means "as the slope of the sides runs down", or "as the water runs down" ? ) Freezing and thaw loosen the surface rock. Debris carried by the running water cuts away the softer surface rock.As the softer base of the mesa recedes, (What does "recedes" mean here? I can not get it! ) the edge of the top is weakened, and it eventually cracks, splits, and falls.
    ... ...

  2. #2
    Join Date
    Jun 2008
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    Default Re: as it runs down, recedes

    Quote Originally Posted by IMPSX-UE View Post
    Hi,

    I was wondering if someone could take a look for me at these two questions.

    Thanks for your help.


    The professor is discussing rock formations.

    ... ...
    On a mesa, condition are optimal for erosion. With enough time, even the durable top of a mesa will decrease in size. The sides of a mesa are often made of shale or softer sandstone. The slope of the sides will increase the water's speed and force as it runs down.( Does it means "as the slope of the sides runs down", or "as the water runs down" ? ) Freezing and thaw loosen the surface rock. Debris carried by the running water cuts away the softer surface rock.As the softer base of the mesa recedes, (What does "recedes" mean here? I can not get it! ) the edge of the top is weakened, and it eventually cracks, splits, and falls.
    ... ...
    Hello IMPSX-UE,

    Your first question: The water runs down the slope

    Your second question: The rock recedes means that base of the mesa erodes and moves back. Imagine you put a stick in the ground against the base of the mesa. Now wait 1,000 years and go back. The stick would still be in the same place, but the base will have moved back and won't be touching the stick anymore -the base will have "receded".

    I hope that helps.

    Matthew Balson
    Competence home

  3. #3
    Join Date
    Dec 2008
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    Default Re: as it runs down, recedes

    Quote Originally Posted by competence View Post
    Hello IMPSX-UE,

    Your first question: The water runs down the slope

    Your second question: The rock recedes means that base of the mesa erodes and moves back. Imagine you put a stick in the ground against the base of the mesa. Now wait 1,000 years and go back. The stick would still be in the same place, but the base will have moved back and won't be touching the stick anymore -the base will have "receded".

    I hope that helps.

    Matthew Balson
    Competence home
    Thank you, competence. I get it now!

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