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Because of the large pressures, over geologic time, the sima flows like a very viscous liquid, so, in a real sense, the sial floats on the sima, in isostatic equilibrium. [9] Mountains extend down as well as up, much like icebergs on the ocean; [9] so that on the continental plates, the sial runs between 5 km and 70 km deep. [10]
The rocks of the crust fall into two major categories – sial (aluminium silicate) and sima (magnesium silicate). [13] It is estimated that sima starts about 11 km below the Conrad discontinuity , [ 14 ] though the discontinuity is not distinct and can be absent in some continental regions.
Sima often takes the form of basalt when on the surface. In geology, sima (/ ˈ s aɪ m ə /) is an antiquated [1] blended term for the lower layer of Earth's crust. This layer is made of rocks rich in magnesium silicate minerals. Typically, when the sima comes to the surface, it is basalt, so sometimes this layer is called the 'ocean layer' of ...
The thickness of Earth's crust (km). The continental crust consists of various layers, with a bulk composition that is intermediate (SiO 2 wt% = 60.6). [5] The average density of the continental crust is about, 2.83 g/cm 3 (0.102 lb/cu in), [6] less dense than the ultramafic material that makes up the mantle, which has a density of around 3.3 g/cm 3 (0.12 lb/cu in).
Sial – Rocks rich in aluminium silicate minerals; Sima – Rocks rich in magnesium silicate minerals; Hydrosphere – Total amount of water on a planet; Lithosphere – Outermost shell of a terrestrial-type planet or natural satellite; Ocean – Body of salt water covering most of Earth; Plate tectonics – Movement of Earth's lithosphere
Bowers also has a shot at the most yards for a season by a rookie tight end — Mike Ditka's 1.076 during the 1961 season. But he might have to pick up his production a bit to overtake that mark ...
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The Australian Reptile Park's spider keeper says she named the spider Hemsworth because the arachnid towers over other spiders, like the Hemsworth brothers