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  Encyclopedia of Keywords > Time > Events > Earthquakes > Plate Tectonics > Continental Crust   Michael Charnine

Keywords and Sections
OCEANIC CRUST
CONTINENTAL CRUSTS
COLLISION ZONE
CRUST BEGINS
THICK
CRUSTAL
LESS DENSE
PASSIVE MARGINS
PLATE CARRIES
THICKNESS
CUBIC
CONSTITUTED
Review of Short Phrases and Links

    This Review contains major "Continental Crust"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. The continental crust is like the igneous rock granite, and the oceanic crust is like basalt, another igneous rock. (Web site)

Oceanic Crust

  1. Obduction is the overthrusting of continental crust by oceanic crust or mantle rocks at a destructive plate boundary.
  2. The thinnest continental crust is found in rift zones, where the crust is thinned by detachment faulting and eventually severed, replaced by oceanic crust. (Web site)
  3. The continental crust and the oceanic crust are sometimes called sial and sima respectively. (Web site)

Continental Crusts

  1. It is a matter of debate whether the amount of continental crust has been increasing, decreasing, or remaining constant over geological time. (Web site)
  2. Much of the continental crust extends above sea level as dry land.
  3. Continental crust is subducted with difficulty, but is subducted to depths of 90-150 km or more, as evidenced by ultrahigh pressure (UHP) metamorphic suites. (Web site)
  4. Mechanically, continental crust divides into a cooler, stronger, brittle upper crust and a hotter, weaker, ductile (putty-like) lower crust. (Web site)

Collision Zone

  1. When buoyant continental crust enters a trench, subduction eventually stops and the convergent plate margin becomes a collision zone.
  2. At a collision zone two plates, whose leading edges are both continental crust, collide. (Web site)

Crust Begins

  1. As the two active rifts continue to open, eventually the continental crust is attenuated as far as it will stretch.
  2. Neoarchean sanukitoid cratons and new continental crust formed Kenorland.
  3. About 40% of the Earth's surface is now underlain by continental crust.
  4. Because continental crust mostly lies above sealevel, its existence allowed land life to evolve from marine life.
  5. Continent - Continent : thickening of the continental crust with accompanying compressive forces. (Web site)

Thick

  1. Many appear to be composed of modified continental crust 20-40 km thick – far thicker than "normal" oceanic crust.
  2. In contrast, continental crust is thick (~45 km thick) and buoyant, composed mostly of granitic rocks.
  3. The continental crust is 20 to 70 kilometers thick and composed mainly of lighter granite (Figure 2). (Web site)

Crustal

  1. Temperatures can also exceed the solidus of a crustal rock in continental crust thickened by compression at a plate boundary.
  2. Crustal foundering builds continental crust. (Web site)
  3. Rudnick, R. L. & Fountain, D. M. 1995. Nature and composition of the continental crust: a lower crustal perspective. (Web site)

Less Dense

  1. Because it contains thick continental crust, this lithosphere is less dense than the underlying asthenospheric mantle and normal subduction is disrupted.
  2. The process starts with heating at the base of the continental crust which causes it to become more plastic and less dense.
  3. Continental crust is much older, thicker and less dense than oceanic crust. (Web site)
  4. Such old continental crust and the underlying mantle lithosphere are less dense than elsewhere in the earth and so are not readily destroyed by subduction. (Web site)

Passive Margins

  1. A passive margin is the transition between oceanic and continental crust which is not an active plate margin. (Web site)
  2. Volcanic passive margins they also are marked by numerous dykes and igneous intrusions within the subsided continental crust. (Web site)

Plate Carries

  1. Tectonic plates can include continental crust or oceanic crust, and typically, a single plate carries both.
  2. A fore-arc setting for most ophiolites also solves the otherwise perplexing problem of how oceanic lithosphere can be emplaced on top of continental crust. (Web site)

Thickness

  1. FIGS. 4B and 5B also depict the relative thickness of continental crust as compared to oceanic crust. (Web site)
  2. Davies, G. F. 1979. Thickness and thermal history of continental crust and root zones. (Web site)

Cubic

  1. Today there are ~7 billion cubic kilometers of continental crust, but in the past there may have been less or more. (Web site)
  2. The density of continental crust is about 2.7 grams per cubic centimeter. (Web site)

Constituted

  1. One model indicates that at prior to 3.7 Ga ago continental crust constituted less than 10% of the present amount. (Web site)
  2. In plate tectonics, for example, Arabia constitutes a separate plate, partially constituted by continental crust. (Web site)

Categories

  1. Time > Events > Earthquakes > Plate Tectonics
  2. Encyclopedia of Keywords > Places > Earth
  3. Glossaries > Glossary of Plate Tectonics /
  4. Books about "Continental Crust" in Amazon.com

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  Short phrases about "Continental Crust"
  Originally created: March 24, 2008.
  Links checked: July 05, 2013.
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