natural periods
11Natural scientific research in Canada — This article outlines the history of natural scientific research in Canada, including mathematics, physics, astronomy, space science, geology, oceanography, chemistry, biology, medical research and psychology. The social sciences are not treated… …
12Natural history of Australia — The natural history of Australia has been shaped by the geological evolution of the Australian continent from Gondwana and the changes in global climate over geological time. The building of the Australian continent and its association with other …
13Natural history — For other uses, see Natural history (disambiguation). Naturalist redirects here. For other uses, see Naturalist (disambiguation). Tables of natural history, from the 1728 Cyclopaedia Natural history is the scientific research of p …
14Natural monopoly — A monopoly describes a situation where all (or most) sales in a market are undertaken by a single firm. A natural monopoly by contrast is a condition on the cost technology of an industry whereby it is most efficient (involving the lowest long… …
15Natural science — Part of a series on Science …
16Natural building — A natural building involves a range of building systems and materials that place major emphasis on sustainability. Ways of achieving sustainability through natural building focus on durability and the use of minimally processed, plentiful or… …
17Natural satellite — Moons redirects here. For other uses, see Moons (disambiguation). Two moons: Saturn s moon Dione occults Enceladus A natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called its primary …
18Natural hazards in Colombia — The 1985 Armero tragedy is the worst natural disaster in Colombian history Natural disasters in Colombia are the result of several different natural hazards that affect the country according to its particular geographic and geologic features.… …
19Natural order — Order Or der, n. [OE. ordre, F. ordre, fr. L. ordo, ordinis. Cf. {Ordain}, {Ordinal}.] [1913 Webster] 1. Regular arrangement; any methodical or established succession or harmonious relation; method; system; as: (a) Of material things, like the… …
20History of the petroleum industry in Canada (natural gas) — Natural gas has been used almost as long as crude oil in Canada, but its commercial development was not as rapid. This is because of special properties of this energy commodity: it is a gas, and it frequently contains impurities. The technical… …
