出典:Wiktionary
natural resource (複数形 natural resources)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/26 19:00 UTC 版)
Natural resources occur naturally within environments that exist relatively undisturbed by mankind, in a natural form. A natural resource is often characterized by amounts of biodiversity and geodiversity existent in various ecosystems. Natural resources are derived from the environment. Many of them are essential for our survival while others are used for satisfying our wants. Natural resources may be further classified in different ways.