CRUST It is the outer most layer of the earth. It is separated from the mantle by the Moho Discontinuity. It has an average thickness of 30 km, although this thickness is variable, which is thinner and denser in the oceans and thicker but less dense on the continents. Continental crust is composed of aluminum silicates (granites), mainly limestone also abound. The oceanic crust is formed by more dense silicates and basalts and less ancient continental crust.
It is the middle layer. It extends from the Moho (30 km) to that of Gutenberg (2900 km). It consists of upper mantle to 700 km, and the lower mantle (up to 2900 km). Basic rocks are composed of more dense (3.5 g/cm3) than the crust, formed mainly by iron and magnesium silicates.
It extends from the Gutenberg discontinuity (2900 km) to the center of the earth (6370 km). Are composed of iron with small amounts of other chemicals (nickel, carbon, etc.).. It can be distinguished: the outer core, until the 5100 km, in liquid form and the inner core solid.
STRUCTURE DYNAMICS: lithosphere and Asthenosphere
It comprises part of the crust and upper mantle to about 75 km depth, is characterized by being rigid. It is thicker in the continents: continental lithosphere (up to 150 km thick) and thinner under the oceans: oceanic lithosphere. It is characterized by being fragmented in large parts called lithospheric plates moving past one another or separating colliding with very slow movements, between 3 cm / year and 12 cm / year. These movements are responsible for the formation of large mountain ranges, volcanism, earthquakes and many other geological phenomena.
It is a plastic layer comprising part of the upper mantle to about 300 km depth, approximately. As more fluid is produced in it calls currents convection currents. These currents are responsible for the movement of the plates.
Scientists monitoring, providing alerts on Pavlof and Cleveland volcanoes Phys.Org At Cleveland volcano, explosions from the summit vent were detected by an infrasound array and seismic instruments on Umnak Island about 80 miles to the east, and...
DMT completes 3D seismic exploration in Rioja, Spain OilVoice (press release) However, seismic waves were produced at nearly 10,000 locations using specialist vehicles and borehole methods and were logged at approx.
Nature World News Earth's Unstable Crust 4 billion Years Ago Dripped Down into Mantle Nature World News The Earth's mantle was much hotter 4 billion years ago during the Archean eon than it is today, according to a new study that sheds light on how...
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