stratigraphic test drilling
21Earth exploration — Introduction the investigation of the surface of the Earth and of its interior. By the beginning of the 20th century most of the Earth s surface had been explored, at least superficially, except for the Arctic and Antarctic regions. Today the… …
22Mining industry of Ghana — accounts for 5% of the country s GDP and minerals make up 37% of total exports, of which gold contributes over 90% of the total mineral exports. Thus, the main focus of Ghana s mining and minerals development industry remains focused on gold.… …
23Cretaceous–Tertiary extinction event — Artist s rendering of bolide impact Badlands nea …
24Mars — This article is about the planet. For other uses, see Mars (disambiguation) …
25plate tectonics — plate tectonic, adj. Geol. a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past… …
26Extinction Crétacé-Tertiaire — Badlands près de Drumheller, Alberta, où l érosion a découvert à l air libre la limite K–T …
