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Define fold with neat sketch

Short answer

A fold is a bend in originally flat rock layers due to compression, forming an anticline (upfold) or syncline (downfold). Parts include limbs, hinge, and axial plane.

Define fold with a neat sketch.

A fold is a bend or wavy curvature of originally flat rock layers (beds), produced by compressive stress acting on plastic rocks over a long time.

            Axial plane
                |
                |        (crest)
          ___   |   ___
        /     \ | /     \
   ____/       \|/       \____
    limb      hinge      limb

Parts: limbs (sides), hinge (line of maximum curvature), axial plane (plane dividing the fold symmetrically), crest (top) and trough (bottom). An upfold is an anticline and a downfold is a syncline.

✓ Answer checked by Claude Opus 5.5 (high effort)

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