21. What is the term for a downfolded structure that is circular or elliptical?
22. Which structure is most associated with compressional forces?
23. Which type of joint is formed due to unloading?
24. The inclination of a rock layer from the horizontal is called?
25. A fold that is overturned and nearly horizontal is called a?
26. The direction of a line in a horizontal plane is known as?
27. Which structure is formed by tensile stress in rocks?
28. What structure has older rocks in the center and beds dipping outward?
29. What is the term for two sets of intersecting joints?
30. Which of the following indicates the intensity of deformation?
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