The crust is the outermost layer of Earth is divided into two categories, namely the ocean crust and continental crust. Oceanic crust has a thickness of about 5-10 km, while continental crust has a thickness of about 20-70 km. The author, a major oceanic crust is basaltic rock, whereas the continental crust rocks are the main constituent is a granite, basalt rock that is not crowded.
The earth's crust and part of the lithospheric mantle to form layers with a total thickness of approximately 80 km.
Crust temperature increases with depth. In the limit of touching digits terbawahnya crust temperature 200-400 oC. The crust and the mantle lithosphere layer of relatively solid shape. Because convection in the upper mantle and asthenosphere, the lithosphere is broken into tectonic plates that move. The temperature increased 30 ° C per km, but the geothermal gradient will be lower in the deeper crust.
The main chemical elements forming the earth's crust are: Oxygen (O) (46.6%), Silicon (Si) (27.7%), Aluminum (Al) (8.1%), Iron (Fe) (5, 0%), Calcium (Ca) (3.6%), Sodium (Na) (2.8%), Potassium (K) (2.6%), Magnesium (Mg) (2.1%).
The experts can reconstruct the layers that exist beneath the earth's surface based on the analysis conducted on seismograms recorded by seismic recording stations in the entire world.
Primordial Earth's crust is very thin, and may undergo a process of tectonic plate recycling by far more active than today and destroyed several times by an asteroid collision, which was very common in the early solar system. The oldest age of oceanic crust at this time is 200 million, but the continental crust has a much older layer. Continental crust of the oldest known today is the age of 3.7 to 4.28 billion years old and found in Narryer Gneiss Terrane in Western Australia and in Acasta Gneiss, Canada.
Formation of continental crust associated with periods of intense orogeny. This period is associated with the formation of such super-continent Rodinia, Pangaea and Gondwana.
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The earth's crust and part of the lithospheric mantle to form layers with a total thickness of approximately 80 km.
Crust temperature increases with depth. In the limit of touching digits terbawahnya crust temperature 200-400 oC. The crust and the mantle lithosphere layer of relatively solid shape. Because convection in the upper mantle and asthenosphere, the lithosphere is broken into tectonic plates that move. The temperature increased 30 ° C per km, but the geothermal gradient will be lower in the deeper crust.
The main chemical elements forming the earth's crust are: Oxygen (O) (46.6%), Silicon (Si) (27.7%), Aluminum (Al) (8.1%), Iron (Fe) (5, 0%), Calcium (Ca) (3.6%), Sodium (Na) (2.8%), Potassium (K) (2.6%), Magnesium (Mg) (2.1%).
The experts can reconstruct the layers that exist beneath the earth's surface based on the analysis conducted on seismograms recorded by seismic recording stations in the entire world.
Primordial Earth's crust is very thin, and may undergo a process of tectonic plate recycling by far more active than today and destroyed several times by an asteroid collision, which was very common in the early solar system. The oldest age of oceanic crust at this time is 200 million, but the continental crust has a much older layer. Continental crust of the oldest known today is the age of 3.7 to 4.28 billion years old and found in Narryer Gneiss Terrane in Western Australia and in Acasta Gneiss, Canada.
Formation of continental crust associated with periods of intense orogeny. This period is associated with the formation of such super-continent Rodinia, Pangaea and Gondwana.
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