limestone (известняк), a type of rock formed from the bones and shells of sea animals over millions of years, karst, an area of land formed of rock such as limestone that is worn away by water to make caves and other formations, erosion, the slow process when water, wind, or ice wears away rock or soil, sinkhole, a hole in the ground, especially in an area of limestone rock, that has been formed naturally, for example by water that has worn away the rock, collapse, to suddenly fall down or break apart, rope bridge, a bridge made of ropes (sometimes wood) that people walk across, canyon, a large valley with very steep sides and usually a river flowing along the bottom

Unit 4. A Unique Landscape

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