- archean stratum
- 太古代层
English-Chinese Dictionary of Agriculture (英汉农业大词典). 2013.
English-Chinese Dictionary of Agriculture (英汉农业大词典). 2013.
Africa — /af ri keuh/, n. 1. a continent S of Europe and between the Atlantic and Indian oceans. 551,000,000; ab. 11,700,000 sq. mi. (30,303,000 sq. km). adj. 2. African. * * * I Second largest continent on Earth. It is bounded by the Mediterranean Sea,… … Universalium
Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… … Wikipedia
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
Earth, geologic history of — Introduction evolution of the continents, oceans, atmosphere, and biosphere. The layers of rock at the Earth s surface contain evidence of the evolutionary processes undergone by these components of the terrestrial environment during the… … Universalium
Stromatolite — Stromatolites (from Greek στρώμα, strōma , mattress, bed, stratum, and λιθος, lithos , rock) are layered accretionary structures formed in shallow water by the trapping, binding, and cementation of sedimentary grains by biofilms of microorganisms … Wikipedia
Grand Canyon — a gorge of the Colorado River in N Arizona. over 200 mi. (320 km) long; 1 mi. (1.6 km) deep. * * * Gorge cut by the Colorado River, northwestern Arizona, U.S. Noted for its rock formations and coloration, it is about 0. 1–18 mi (0.2–29 km) wide… … Universalium
Noachian — MOLA colorized relief map of Noachis Terra, the type area for the Noachian System. Note the superficial resemblance to the lunar highlands. Colors indicate elevation, with red highest and blue violet lowest. The blue feature at bottom right is… … Wikipedia