natural periods
21Florida Museum of Natural History — Coordinates: 29°38′09″N 82°22′13″W / 29.63583°N 82.37028°W / 29.63583; 82.37028 …
22List of archaeological periods — Names for archaeological periods vary enormously from region to region. This is a list of the main divisions by continent and region. Dating also varies considerably and those given are broad approximations across wide areas.The three age system… …
23Microsoft Natural keyboard — Pro, circa Q4 1999. The Microsoft Natural Keyboard is a computer keyboard that was introduced by Microsoft in 1994. The keyboard was a split keyboard with each half of the keyboard separated and tilted upwards and down from the center of the… …
24San Diego Natural History Museum — The San Diego Natural History Museum was founded in 1874 as the San Diego Society of Natural History. The present location of the museum in San Diego s Balboa Park was dedicated on January 14, 1933. [ [http://www.sdnhm.org San Diego Natural… …
25Seven Tubs Natural Area — The Seven Tubs Natural Area is a publicly accessible recreation area located in Luzerne County, Pennsylvania, and owned by the Luzerne County parks and recreation department. Continuously flowing glacial melt water gouged a line of smooth tubs in …
26Renewable natural gas — Renewable natural gas, also known as sustainable natural gas, is a biogas which has been upgraded to a quality similar to natural gas. A biogas is a gas obtained from biomass. By upgrading the quality to that of natural gas, it becomes possible… …
27Cliffs Natural Resources — Type Public (NYSE: CLF …
28Oil Price to Natural Gas Ratio — A mathematical ratio comparing the prices of crude oil and natural gas. In the oil price to natural gas ratio formula, the oil price is the numerator and the price of natural gas is the denominator. This ratio is used by energy analysts, traders… …
29dormancy — /dawr meuhn see/, n. the state of being dormant. [1780 90; DORM(ANT) + ANCY] * * * ▪ biology Introduction state of reduced metabolic activity adopted by many organisms under conditions of environmental stress or, often, as in winter, when… …
30Soil structure interaction — Most of the civil engineering structures involve some type of structural element with direct contact with ground. When the external forces, such as earthquakes, act on these systems, neither the structural displacements nor the ground… …
