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crust, a mantle, and a core.

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9y ago

The three layers of the Earth( because there is another layer so it is not main) . Based on chemical composition are the core, the mantle and the crust. The core is the inner part of the earth, the crust is the outer part and between them is the mantle.

The Core: At the centre of the Earth is the core. It's upper boundary is approximately 1,800 miles (2,900 km) below the surface. The core is predominately formed of iron (85 %) and nickel (5 %) with a number of siderophile (iron liking elements forming the remainder). It is divided into two layers based on the cores state of matter, the inner core and the outer core. The inner core which is at the very centre of the Earth is a solid layer approximately 780 miles (1,250 km) thick. The core is at a very high temperature and so the outer core is always molten, however as the depth within the core increase the pressure drives the melting temperature up above the in-situ temperatures even though they reach 6700ºF (3700ºC). The outer core is approximately 1370 miles (2,200 km) thick. It is thought that the movement of the liquid outer core is responsible for the creation of earth's magnetic field.

The Mantle: The mantle lies directly above the core (this boundary is known as the core-mantle-boundary or Gutenberg discontinuity and is named after the geophysicist who discovered it (trivia - Beno Gutenberg, the geophysicist in question also worked with Charles Richter in the development of the Richter magnitude scale). It's upper boundary lies approximately 6 miles (10 km) below the surface of the oceanic crust and about 19 miles(30 km) below the surface of the continental crust. The mantle is broadly divided into two main sections. The upper and the lower mantle based on changes in the crystalline structure of the mantle material caused by pressure changes at increasing depths. The mantle is approximately 1,800 miles (2,900 km) thick and makes up nearly 80 percent of the Earth's total volume.

The Crust: The crust lays above the mantle and forms the upper portion of the earth's solid brittle and hard outer shell, the surface on which we are living. The crust is significantly thinner than the other layers of the earth and can be thought to float upon the denser mantle material. The Earth's crust is split into two main types, oceanic and continental crust. The main differences being in their composition which in turn effects their density and thickness. Oceanic crust is composed predominantly of mafic minerals (those with higher concentrations of the elements iron and magnesium) forming rocks such as basalt whereas the continental crust is composed mainly of felsic minerals (higher concentrations of silicon and aluminum). Continental crust tends to be less dense than oceanic crust and also of greater thickness (19 miles - 30 km thick vs 4-7 miles or 6-11 km for oceanic crust).

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8y ago

crust, a mantle, and a core.

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mnbvcfgyuikjhbhuyubyhbiiubvghivigy 9gov9gv

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3y ago

core mantle

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Q: What are the three main layers of the Earth?
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Related questions

What are three main layers that make up earth are.?

The three main layers that make up Earth is:CORE, MANTLE, and the CRUST


What are the three main layers that's make up earth are the?

the core, the mantle and the crust


What are the three layers that make up earth?

The three main layers that make up Earth is:CORE, MANTLE, and the CRUST


What are the three layers of the Earth based on composition?

crust mantel core the three main layers


What are the 3 main layers of the earth?

MantleCrustcore


What are the three main layers earth?

crust mantle and outer core


How do Earth's three main layers differ from one another?

Some material and/or metals are present in different layers.


Earth is composed what of main three layers?

Crust, mantle, and core


How many layers are of the earth?

The earth has a total of 6 main layers.


Three main layers thay make up earth are?

The three main layers of the earth are the Core, Mantle and Crust. The Core is mostly made from iron and nickel, the Crust from oxygen, silicon and aluminum and the mantle silicon,oxygen,iron and magnesium.


What defines the three main parts of the solid earth?

IDK find it out yourself you cheater I'm kidding it is the crust,inner core,and the lithosphere


How many layers of the earth are there in all?

There are three main layers based on composition: the crust, the mantle, and the core. There are numerous physical layers. See the link below.