The internal structure of the Earth is made up of the asthenosphere, the upper mantle, the lower mantle, the outer core and the inner core. These structures support the crust of the Earth.Continue Reading
The asthenosphere is a semisolid layer of hot rock that's found at the top of the upper mantle. It is thinner beneath the oceanic crust and thicker beneath the terrestrial crust. The transition between the crust and the upper mantle is known as the Mohorovi?i? discontinuity, or the Moho.
The mantle proper makes up most of the Earth's internal structure. The upper mantle is about 410 miles thick. Earthquakes don't originate deeper than this.
Another discontinuity separates the upper mantle from the lower mantle, which then extends down to 1678 miles to the outer core. At these depths, the pressures and heat change the nature of the rocks. There are also a couple of discontinuities, including the mysterious D double prime. There, the rocks are subject to pressures of as much as 20 million pounds per square inch.
The core of the Earth is in its center. The outer core is liquid, a little over 1300 miles in diameter and made of an alloy of nickel and iron. The inner core is about 760 miles in diameter and is made of solid iron.Learn more about Earth Science
The heat that is present in Earth's mantle is made up of leftover heat from when the planet was formed, latent heat from the Earth's inner core and heat produced by the decay of radioactive isotopes. The majority of the heat is caused by the decay of isotopes such as potassium 40 and uranium 238.Full Answer >
The Earth acts as a magnet because of electric currents generated through the movement of iron in the Earth's molten core. This motion creates a very weak magnetic force that expands from Earth reaching tens of thousands of miles into space.Full Answer >
The Earth consists of four layers: crust, mantle, outer core and inner core. Each layer has its own properties and characteristics that separates it from the other layers.Full Answer >
The Earth is divided into four layers: crust, mantle, outer core and inner core. The crust is the only layer of Earth that hosts life, as the mantle, inner core and outer core are too hostile for organisms to exist.Full Answer >