Outcrop

(noun.) the part of a rock formation that appears above the surface of the surrounding land.

(verb.) appear on the surface, come to the surface on the ground; 'Big boulders outcropped'.

校对:苏西

• They showed the surface outcrops of strata, and were intended to be of assistance in mining, roadmaking, canal construction, dra ining, and water supply. 李贝. 西洋科学史.

录入:奥利维尔