natural drainage hole
61sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
62Grianan of Aileach — The Grianan of Aileach (also spelled Ailech; Irish: Grianán Ailigh ) is a group of historic monuments in County Donegal, Ireland built on the hill of Grianán which is 244 metres high. Most writers have identified the site as being the great… …
63Heliciculture — (snail farming) is the process of farming or raising snails.HistoryRoasted snail shells have been found in archaeological excavations, an indication that snails have been eaten since prehistoric times [ [http://watarts.uwaterloo.ca/… …
64Ocean fisheries — A fishery is an area with an associated fish or aquatic population which is harvested for its commercial value. Fisheries can be wild or farmed. Most of the world s wild fisheries are in the ocean. This article is an overview of ocean fisheries.… …
65Earth exploration — Introduction the investigation of the surface of the Earth and of its interior. By the beginning of the 20th century most of the Earth s surface had been explored, at least superficially, except for the Arctic and Antarctic regions. Today the… …
66Somerset — This article is about the county of Somerset in England. For other uses, see Somerset (disambiguation). Somerset Motto of County Council: Sumorsǣte ealle ( All The People of Somerset ) …
67North York Moors — Protected Area The North York Moors from space Country …
68Wastewater — For the lake in Northwestern England, see Wastwater. Public infrastructure …
69Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… …
70Course of the Rogue River (Oregon) — This article is about the course of the river in Southern Oregon. For the river in Polk County, Oregon, see Rogue River (South Yamhill River). Coordinates: 42°25′21″N 124°25′45″W / …
