syncline
noun/ˈsɪŋklaɪn/
/ˈsɪŋklaɪn/
(geology)- an area of ground where layers of rock in the earth’s surface have been folded into a curve that is lower in the middle than at the ends compare anticlineWord Originlate 19th cent.: from syn- ‘together’ + Greek klinein ‘to lean’, on the pattern of incline.
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syncline