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The basic soil, along with calcium carbonate from the caliche, can prevent plants from getting enough nutrients, especially iron. An iron deficiency makes the youngest leaves turn yellow. Soil saturation above the caliche bed can make the condition worse. [22] Its hardness can also make digging for projects such as canals more difficult.
Chalk is a soft, white, porous, sedimentary carbonate rock.It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor.
The word badlands is a calque from the Canadian French phrase les mauvaises terres, as the early French fur traders called the White River badlands les mauvaises terres à traverser or 'bad lands to traverse', perhaps influenced by the Lakota people who moved there in the late 1700s and who referred to the terrain as mako sica, meaning 'bad ...
The Alboran Basin south of Spain and Gibraltar formed in the early Miocene by extending and thinning continental crust to only 12 or 15 km thick. It is still filling with sediment to this day beneath the Alboran Sea. So far 8 km of sediments have accumulated. The Alboran sea has numerous areas on its floor formed from volcanic flows.
Recent earthquakes that struck Colombia's Pacific coast areas have included one accompanied by a tsunami in Tumaco, Nariño Department, on December 12, 1979, measuring 7.9 on the Richter magnitude scale, the largest in northwestern South America since 1942; another on November 15, 2004, with a magnitude of 6.7; and one on September 10, 2007 ...
The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England. The same or similar rock sequences occur across the wider northwest European chalk 'province'.
Map of pre-Columbian cultures Poporo Quimbaya in the Gold Museum, Bogotá Colombia Seated gold figure from the Museo de América (Museum of America). Quimbaya artifacts refer to a range of primarily ceramic and gold objects surviving from the Quimbaya civilisation, one of many pre-Columbian cultures of Colombia inhabiting the Middle Cauca River valley and southern Antioquian region of modern ...
Environmentally, Colombia is a mega-diverse country from its natural land terrain to its biological wildlife. [1] Its biodiversity is a result of its geographical location and elevation. [2] It is the fourth largest South American country and only country in South America to have coasts on the Pacific and Caribbean Sea. [3]