section with reversed polarity

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• Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century …   Wikipedia

• Geomagnetic reversal — Magnetic reversal redirects here. For switching of a magnet, see Magnetization reversal. Geomagnetic polarity during the late Cenozoic Era. Dark areas denote periods where the polarity matches today s polarity, light areas denote periods where… …   Wikipedia

• Magnetostratigraphy — is a geophysical correlation technique used to date sedimentary and volcanic sequences. The method works by collecting oriented samples at measured intervals throughout the section. The samples are analyzed to determine their characteristic… …   Wikipedia

• Bass guitar — A Music Man Stingray bass String instrument Other names Bass, electric bass guitar, electric bass. Classification …   Wikipedia

• electronics — /i lek tron iks, ee lek /, n. (used with a sing. v.) the science dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors. [1905 10; see ELECTRONIC,… …   Universalium

• sun — sunlike, adj. /sun/, n., v., sunned, sunning. n. 1. (often cap.) the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93… …   Universalium

• Humbucker — A conventional humbucker (or Humbucking pickup) is a type of electric guitar pickup that uses two coils, both generating string signal. Humbuckers have high output since both coils are in series and because the magnetic circuit is low loss. Like… …   Wikipedia

• electric motor — motor (def. 4). [1885 90] * * * Introduction       any of a class of devices that convert electrical energy to mechanical energy, usually by employing electromagnetic phenomena.       Most electric motors develop their mechanical torque by the… …   Universalium

• Van der Pauw method — The van der Pauw Method is a commonly used technique to measure the sheet resistance of a material. The Van der Pauw method is often used to measure the Hall effect, which characterises a sample of semiconductor material and can be successfully… …   Wikipedia

• Musical improvisation — (also known as Musical Extemporization) is the creative activity of immediate ( in the moment ) musical composition, which combines performance with communication of emotions and instrumental technique as well as spontaneous response to other… …   Wikipedia

• Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …   Universalium