Below the crust is the mantle, which is divided into upper and lower sections. This layer is nearly km thick. This term is used to describe the crust and rigid top part of the upper mantle. The lithosphere is tough and brittle it can break in earthquakes. This is the part of the earth that forms the tectonic plates.
This is the lower part of the upper mantle below the lithosphere. It is very soft and plastic squishable ; although it is solid, it flows slowly. This is below the mantle and consists of liquid iron, nickel and sulphur. It ranges from about - degrees C, and is about km thick. This flowing metal creates the earth's magnetic field. You can trust us in any situation as we have already made hundreds of students' lives easier and saved so many careers.
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Get a Price Type of paper: Please specify the deadline in advance, to have some time to review the paper. Contact Us Toll-free for US customers: Please enter a valid email address or phone number. Thank you for your interest in our services! During this period, a solid, inner core and a semi liquid outer core took shape. Most scientists believe this inner core is still heated by warmth left over from the collision and accretion of the many asteroids and meteors that originally formed the planet.
Scientists now estimate that the Earth's solid-iron, inner core is about miles across, about the same size as the moon. The liquid iron, outer core is about miles across. Mantle Back to Top. Comparing the Earth with a giant, hard boiled egg means the mantle is like the egg's thick, squishy white part. As the planet cooled and the heavy iron fell to the center, the lighter silicate rocks floated in the mantle above.
Silicate include all kinds of rocks, usually containing the elements silicon and oxygen. Earth's mantle is believed to be made up of mostly silicate rocks. Rocks in the mantle look more like those typically found at the Earth's surface. However, these rocks are kept warm by both the decay of radioactive elements and by the heat from the core. Because they are also subjected to pressure from the crust above, they tend to be semi liquid or viscous. The mantle, like the core, is thought to have formed very early in the history of the Earth.
Many earth scientists divide the mantle into the upper and lower mantle based on the properties and behaviors of the different rocks. Crust Back to Top.
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The crust sits atop the mantle, although the liquid magma of the mantle sometimes breaks through. When this magma cools, it hardens into part of the outer crust. In some places, like the bottom of the ocean, the crust is quite thin.
This part of the earth is about 1, miles (2, km) below the earth's surface. The core is a dense ball of the elements iron and nickel. The layer above the core is the mantle. Chemically, the earth’s surface can be divided into crust, upper mantle, lower mantle, outer core and inner core. Inner core The solid inner core has the radius of nearly km, suspended in .
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