• Sedimentary rocks form with the oldest layers on the bottom and the youngest on top.
  • Sedimentary rocks that are not horizontal must be deformed.
  • This deformation produces geologic structures such as folds, joints, and faults that are caused by stresses.
  • The arid climate allows rock layers to be well exposed.
  • The lowest layers are the oldest, and the higher layers are younger.
  • The law of superposition deals with the positions of rock layers.
  • Use the resource below to answer the questions that follow.
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