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 and these repetitive behaviors are

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.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.