Final answer:
Compression stress at convergent boundaries causes rocks to fold.
Explanation:
Compression stress is the type of stress that causes rocks to fold. When rocks are squeezed together, such as at convergent plate boundaries, they tend to shorten laterally and thicken vertically, resulting in great folds in the rock.
Compression is common at convergent boundaries where plates collide, leading to the compression of rocks. This type of stress is responsible for the folding of rocks, as seen in regions where plates are being squeezed together.
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