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Expanding Earth
The expanding Earth or growing Earth hypothesis argues that the position and relative movement of continents is at least partially due to the volume of Earth increasing. Conversely, geophysical global cooling was the hypothesis that various features could be explained by Earth contracting. Although it was suggested historically, since the recognition of plate tectonics in the 1970s, scientific consensus has rejected any significant expansion or contraction of Earth. Different forms of the hypothesis Expansion with constant mass In 1834, during the second voyage of HMS ''Beagle'', Charles Darwin investigated stepped plains featuring raised beaches in Patagonia which indicated to him that a huge area of South America had been "uplifted to its present height by a succession of elevations which acted over the whole of this space with nearly an equal force." While his mentor Charles Lyell had suggested forces acting near the crust on smaller areas, Darwin hypothesized that uplift a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vom Wachsenden Erdball
''Bloodhype'' (1973 in literature, 1973) is a science fiction novel by American writer Alan Dean Foster. The book is eleventh chronologically in the Pip and Flinx series, though it was written second; the main characters only appear in the last third of the book. In the series, it falls after ''Orphan Star'', where Flinx meets the aliens who build him his ship, the Teacher. The novel takes its title from a deadly and addictive drug, for which there is no known antidote, and which causes instant addiction followed by a long, slow, painful death unless the user continues to take increasingly greater doses. Plot The Vom is an intergalactic intelligence described as a large black blob resembling a gigantic amoeba, impervious to almost all energy and physical attack. Following years of battle with the Tar-Aiym it has sheltered on a planet where it has gone dormant for 500,000 years, waiting for an opportunity to escape the Tar-Aiym Guardian orbiting in space above it. Carmot MMYM, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanism
Volcanism, vulcanism or volcanicity is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the surface called a vent. It includes all phenomena resulting from and causing magma within the crust or mantle of the body, to rise through the crust and form volcanic rocks on the surface. Magmas, that reach the surface and solidify, form extrusive landforms. Volcanic processes Magma from the mantle or lower crust rises through the crust towards the surface. If magma reaches the surface, its behavior depends on the viscosity of the molten constituent rock. Viscous (thick) magma produces volcanoes characterised by explosive eruptions, while non-viscous (runny) magma produce volcanoes characterised by effusive eruptions pouring large amounts of lava onto the surface. In some cases, rising magma can cool and solidify without reaching the surface. Inste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ott Christoph Hilgenberg
Ott, OTT or O.T.T. may refer to: Entertainment * OTT (group), a pop band from the late 1990s * Ott (record producer), British record producer and musician * "O.T.T" (song), a song by Fugative * ''O.T.T.'' (television series), a UK TV programme from the early 1980s presented by Chris Tarrant * ''O.T.T.'', name of the re-release of Exciter's 1988 self-titled album Other uses * Ongi kuden (就註法華経口伝) or "The Record of the Orally Transmitted Teachings", a text in Nichiren Buddhism * Ott (name), a surname and given name, including a list of notable people with the name * OTT Airlines, a Chinese airline based in Shanghai * An abbreviation for Ottawa, Ontario, Canada ** Ottawa Senators, a National Hockey League team * Over-the-top media service, a delivery method for video and audio over the Internet, abbreviated OTT or OtT * Over the Top Wrestling, an Irish Wrestling promotion See also * Otte Otte is a surname and given name. Notable persons with that name include: Give ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanical Explanations Of Gravitation
Mechanical explanations of gravitation (or kinetic theories of gravitation) are attempts to explain the action of gravity by aid of basic mechanical processes, such as pressure forces caused by pushes, without the use of any action at a distance. These theories were developed from the 16th until the 19th century in connection with the aether. However, such models are no longer regarded as viable theories within the mainstream scientific community and general relativity is now the standard model to describe gravitation without the use of actions at a distance. Modern " quantum gravity" hypotheses also attempt to describe gravity by more fundamental processes such as particle fields, but they are not based on classical mechanics. Screening This theory is probably the best-known mechanical explanation, and was developed for the first time by Nicolas Fatio de Duillier in 1690, and re-invented, among others, by Georges-Louis Le Sage (1748), Lord Kelvin (1872), and Hendrik Lorentz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aether Theories
In physics, aether theories (also known as ether theories) propose the existence of a medium, a space-filling substance or field as a transmission medium for the propagation of electromagnetic or gravitational forces. Since the development of special relativity, theories using a substantial aether fell out of use in modern physics, and are now replaced by more abstract models. This early modern aether has little in common with the aether of classical elements from which the name was borrowed. The assorted theories embody the various conceptions of this medium and substance. Historical models Luminiferous aether Isaac Newton suggests the existence of an aether in the Third Book of ''Opticks'' (1st ed. 1704; 2nd ed. 1718): "Doth not this aethereal medium in passing out of water, glass, crystal, and other compact and dense bodies in empty spaces, grow denser and denser by degrees, and by that means refract the rays of light not in a point, but by bending them gradually in cu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ivan Osipovich Yarkovsky
Ivan Osipovich Yarkovsky ( pl, Jan Jarkowski) (24 May 1844, Verkhnyadzvinsk Raion, Asveya, Vitebsk Governorate – 22 January 1902, Heidelberg) was a Polish Russian civil engineer. Born from a Poland, Polish family in Verkhnyadzvinsk Raion, Asveya (Russian Empire, now Belarus), he worked for a Russian railway company and was obscure in his own time. Beginning in the 1970s, long after Yarkovsky's death, his work on the effects of thermal radiation on small objects in the Solar System (e.g., asteroids) was developed into the Yarkovsky effect and the Yarkovsky-O'Keefe-Radzievskii-Paddack effect, YORP effect, thanks to his rediscovery by Estonian astronomer Ernst J. Öpik. The asteroid 35334 Yarkovsky is named in his honour . In 1888, he also created a Mechanical explanations of gravitation, mechanical explanation of gravitation. References Literature * * External links Citations for asteroids discovered at Sormano Astronomical Observatory 1844 births 1902 deaths People fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals and gas bubbles. Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing. Following its ascent through the crust, magma may feed a volcano and be extruded as lava, or it may solidify underground to form an intrusion, such as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joint (geology)
A rock in Abisko fractured along existing joints possibly by mechanical frost weathering A joint is a break (fracture) of natural origin in a layer or body of rock that lacks visible or measurable movement parallel to the surface (plane) of the fracture ("Mode 1" Fracture). Although joints can occur singly, they most frequently appear as joint sets and systems. A ''joint set'' is a family of parallel, evenly spaced joints that can be identified through mapping and analysis of their orientations, spacing, and physical properties. A ''joint system'' consists of two or more intersecting joint sets. The distinction between joints and faults hinges on the terms ''visible'' or ''measurable,'' a difference that depends on the scale of observation. Faults differ from joints in that they exhibit visible or measurable lateral movement between the opposite surfaces of the fracture ("Mode 2" and "Mode 3" Fractures). Thus a joint may be created by either strict movement of a rock la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Holmes
Arthur Holmes (14 January 1890 – 20 September 1965) was an English geologist who made two major contributions to the understanding of geology. He pioneered the use of radiometric dating of minerals, and was the first earth scientist to grasp the mechanical and thermal implications of mantle convection, which led eventually to the acceptance of plate tectonics. Life He was born in Hebburn, County Durham, near Newcastle upon Tyne, the son of David Holmes, a cabinet-maker, and his wife, Emily Dickinson. As a child, he lived in Low Fell, Gateshead, and attended the Gateshead Higher Grade School (later Gateshead Grammar School). At 17, he enrolled to study physics at the Royal College of Science (now Imperial College London), but took a course in geology in his second year, which settled his future, against the advice of his tutors. Surviving on a scholarship of £60/year was difficult and on graduating hall, he took a job prospecting for minerals in Mozambique. After six months, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radioactive Decay
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay ( ), beta decay ( ), and gamma decay ( ), all of which involve emitting one or more particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force. A fourth type of common decay is electron capture, in which an unstable nucleus captures an inner electron from one of the electron shells. The loss of that electron from the shell results in a cascade of electrons dropping down to that lower shell resulting in emission of discrete X-rays from the transitions. A common example is iodine-125 commonly used in medical settings. Radioactive decay is a stochastic (i.e. random) proce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Joly
John Joly FRS (1 November 1857 – 8 December 1933) was an Irish physicist and professor of geology at the University of Dublin, known for his development of radiotherapy in the treatment of cancer. He is also known for developing techniques to more accurately estimate the age of a geological period, based on radioactive elements present in minerals, the uranium–thorium dating.Obituary, Irish Times, 16 December 1933, page 1 Career Joly was born in Holywood House (the Church of Ireland Rectory), Bracknagh, County Offaly, Ireland. He was a second cousin of Charles Jasper Joly, the astronomer. He entered Trinity College, Dublin in 1876, graduating in Engineering in 1882 in first place with several special certificates in branches of engineering, at the same time obtaining a First Class Honours in modern literature. He worked as a demonstrator in Trinity's Engineering and Physics departments before succeeding William Johnson Sollas in the Chair of Geology and Mineralogy in 1897, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
