cliff /klɪf/ (n.) a high area of rock with a very steep side, often at the edge of the sea or ocean Example: It is a land of mountains, with steep river valleys and cliffs.
glacier /ˈɡlasɪə/ (n.) a slow-moving mass or river of ice, formed from snow on mountains or near the North Pole or South Pole Example: He said the glaciers in the mountains of Europe now are crumbling due to global warming.
shore /ʃɔː/ (n.) the land along the edge of the sea, the ocean or a lake Example: I made for the shore.
volcano /vɒlˈkeɪnəʊ/ (n.) a mountain with a large opening at the top through which gases and lava (= hot liquid rock) are forced out into the air, or have been in the past Example: This volcano hasn't erupted for years.
waterfall /ˈwɔːtərfɔːl/ (n.) a place where a stream or river falls from a high place, for example over a cliff or rock Example: Angel Falls is the highest waterfall in the world.