8. folds are examples of deformation while faults or fractures are types of deformation. a. brittle, ductile b. ductile, brittle the axial trace (also known as fold axis) is the imaginary line that divides a fold in half. notice when the units are dipping away from each other they form a structure called an antiform. notice when the units on either side of the axial trace are dipping towards each other, they form a synform. 9. anticlines have the unit in the middle of the fold. a. oldest b. youngest 10. synclines have the unit in the middle of the fold. a. oldest b. youngest

Folds are bends in rocks caused by compressional pressures. Tensional forces along which rock displacement occurs cause deformation. When compressional force is applied to ductile or flexible rocks, folding results.

Rocks folded into an arching upward and dipping away from the fold's center are called anticlines. The youngest rocks are draped over the oldest, which are located in the center of an anticline. An adome is a structure formed when rocks arch upward to form a circle. So the correct option is a.

A syncline is a fold in the ground where the oldest rocks are on the outside and the youngest rocks are on the inside. A basin is created when rocks bend downward in a circular pattern. So the correct option is b.

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