Professor paragon spends at least half an hour before each class cleaning the whiteboard. even streaks from the cleaning spray create an overwhelming tension for him, and he is preoccupied by the idea that previous markings are dirty and will contaminate his notes. over the past month, his inability to stop washing the board has led to increasingly delayed class start times. professor paragon's anxious thoughts are obsessions and these repetitive behaviors are compulsions. Commonly known as OCD, it is a form of anxiety that causes people to suffer from chronic and unavoidable patterns of unwanted intrusive thoughts that can not be suppressed or ignored despite having the desire to do so.
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Answer: They were tilted after they were deposited; they were originally deposited horizontally; the youngest layer was originally deposited as the bottom layer; their relative ages have not changed even though they are tilted.
Geologic tilting is the process by which the Earth's rock layers begin to slant irregularly. This can be caused by vertical or horizontal faults, <em>angular unconformity</em> and disturbances on the Earth's magnetic field.
A geologist cannot know the exact age of a rock layer just from looking at it. The information can only be obtained by other methods, to an approximation. He can, however, know that the youngest layer is the one that was originally at the bottom. He also knows that the relative age of the layers has not changed.
<em>Angular unconformity</em> occurs when a new layer of sedimentary rock is deposited on layers that were already tilted, thus exacerbating it. By looking at the layer carefully, the geologist can find out whether the tilting happened while the sediments were being deposited, or afterwards. He can also know which way they were originally deposited by studying characteristics such as cracks and ripple marks.
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