20 take a book from your pack or book shelf bend the

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20. Take a book from your pack or book shelf. Bend the pages into a fold. Now imagine that the pages of your book represent a sequence of sandstones beds separated by mudstones. That is, the first page is a sandstone bed, the second a mudstone bed, the third another sandstone bed, etc.. The surface that contains all of the hinge lines in a given fold in a sequence of beds is called the _______________________. 21. Look closely at the fold that you created in the pages of the book (see previous question). Note the geometrical relationship between the axial surface and the rest of the fold. The limbs of the fold occur on either side of the axial surface. The axial surface _________________ the limbs of a fold. 22. Please answer the question shown in the following illustration?
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23. Please answer the question shown in the following illustration? 24. Please answer the question shown in the following illustration? 25. In an anticline layers of Earth material converge in what direction? 26. In a syncline layers of Earth material converge in what direction? 27. Please answer the question shown on the following illustration.
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28. Please answer the question shown on the following illustration. 29. Which of the following is not a stress term? (a) megaPascal, (b) Pascal, (c) kilobars, (d) kilometers 30. Plastic material when stressed beyond a certain critical point called the yield stress flows readily. After unloading (i.e., removing the imposed stress) a plastic material it will _______________________. 31. When a stress is applied to an elastic material its response will vary dramatically from that of a plastic material. After unloading (i.e., removing an applied stress) an elastic material it will __________________________.
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