Question

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in this photograph, which rock formation is
represented by the blue lines?
anticline
fault
syncline
joint

Explanation:

An anticline is an arch - like fold where the rock layers are convex upward. A fault is a fracture or discontinuity in a rock mass. A syncline is a fold that is concave upward, with the youngest rock layers at the center of the fold. A joint is a fracture in rock where there has been no movement. In the image, the blue lines represent a concave - upward structure, which is characteristic of a syncline.

Answer:

syncline