题目内容

According to the relationship of the axial plane to the limbs, fold can be classified into:

A. symmetrical
B. overturned
C. recumbent
D. asymmetrical

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According to the shapes of folds in cross-section, folds can be classified into:

A. box fold
B. overturned fold
C. fan fold
D. chevron fold
E. monocline

Rock deformations usually include brittle deformation and ductile deformation.

Strain is the change in shape of a rock caused by differential stress.

Tensional stress is the stress which pulls apart a rock unit and lengthens it.

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