Scope Notes: Before 1972, also search geological exploration or geologic exploration. Before 1981, also search prospecting. As of 1983, may be used with certain commodities: all of the energy sources and water resources. As of 1993, see coal exploration and petroleum exploration (including natural gas) for those commodities. After 2004, see geothermal exploration. See mineral exploration for all other commodities. Continues to be used with Moon and the individual planets.