polar wandering

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• polar wandering — noun Movement of the magnetic poles and of the poles of the earth s rotation through geological time • • • Main Entry: ↑polar …   Useful english dictionary

• polar wandering — Migration of the magnetic poles of the Earth through geologic time. Scientific evidence indicates that the magnetic poles have slowly and erratically wandered across the surface of the Earth. Pole locations calculated from measurements on rocks… …   Universalium

• plate 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… …   Universalium

• geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… …   Universalium

• continental drift — Geol. the lateral movement of continents resulting from the motion of crustal plates. Cf. plate tectonics. [1925 30] * * * Large scale movements of continents over the course of geologic time. The first complete theory of continental drift was… …   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

• geomagnetic reversal — Alternation of the Earth s magnetic polarity. The Earth s internal magnetic field reverses, on average, about every 300,000 to 1 million years. This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years. The time… …   Universalium

• Keith Runcorn — Stanley Keith Runcorn (* 19. November 1922 in Southport (Lancashire); † 5. Dezember 1995 in San Diego) war ein britischer Geophysiker. Er befasste sich unter anderem mit Paläomagnetismus und fand frühe Beweise für die Plattentektonik.… …   Deutsch Wikipedia

• Runcorn, Stanley Keith — ▪ 1996       British geophysicist (b. Nov. 19, 1922, Southport, Lancashire, England d. Dec. 5, 1995, San Diego, Calif.), was the first to discover evidence of the periodic polar reversals of the Earth s magnetic field. In the 1950s he was a… …   Universalium

• Paleomagnetism — is the study of the record of the Earth s magnetic field preserved in various magnetic minerals through time. The study of paleomagnetism has demonstrated that the Earth s magnetic field varies substantially in both orientation and intensity… …   Wikipedia

• Karoo Ice Age — The Karoo Ice Age from 300–400 Ma (million years ago) was the second major period of glaciation of the Phanerozoic Eon. It is named after the glacial tills found in the Karoo region of South Africa where evidence for this ice age was first… …   Wikipedia