lacustrine water
21Tufa — Not to be confused with tuff, a porous volcanic rock. This article is about the geological formation. For the historic Chinese name, see Southern Liang. Tufa columns at Mono Lake, California Tufa is a variety of limestone, formed by the… …
22sedimentary 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… …
23Oil shale — For the scientific technical journal, see Oil Shale (journal). Not to be confused with Shale oil or Tight oil. Oil shale Sedimentary Rock Combustion of oil shale Composition …
24Mexico City — a city in and the capital of Mexico, in the central part. 8,906,000; ab. 7400 ft. (2255 m) above sea level. Official name, México, Distrito Federal /me hee kaw dees tree taw fe dhe rddahl /. * * * Spanish Ciudad de México City (pop., 2000: city,… …
25Pleistocene Epoch — Earlier and longer of the two epochs that constitute the Quaternary Period. The Pleistocene began с 1.8 million years ago and ended с 10,000 years ago. It was preceded by the Pliocene Epoch of the Tertiary Period and followed by the Holocene… …
26Kankakee River — Geobox|River name = Kankakee River native name = Aukiki other name = other name1 = image size = 300 image caption = the Kankakee River from Kankakee, Illinois near Cobb Park. country = United States country1 = state = Indiana state1 = Illinois… …
27playa — /pluy euh/, n. Western U.S. the sandy, salty, or mud caked flat floor of a desert basin having interior drainage, usually occupied by a shallow lake during or after prolonged, heavy rains. Cf. dry lake. [1850 55, Amer.; < Sp: shore < LL plagia;… …
28Geography of Ethiopia — Map of Ethiopia. Satellite image of Ethiopi …
29Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …
30Ecology of the Sierra Nevada — See Sierra Nevada for general information about the mountain range in the United States. The Ecology of the Sierra Nevada, located in the U.S. state of California, is diverse and complex: the plants and animals are a significant part of the… …
