Describe elements of a fold. Also discuss classification of folds based on their special properties giving neat well labelled diagrams. 

A fold is a type of structural feature in the Earth's crust that occurs when rocks are subjected to compressive stress. It is a key component in the study of plate tectonics and can provide valuable information about the geological history of a region. The following are some of the key elements of a fold:

1. Axial plane: The axial plane is a plane that runs perpendicular to the direction of compressive stress and bisects the fold into two symmetrical halves. It can be visualized as the line where the two sides of the fold come together.

2. Limbs: The limbs are the two sides of the fold that are on either side of the axial plane. They can be convex or concave, depending on the direction of compressive stress.

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