Compositional+Zones+of+the+Earth

=The Earth has many layers to it like an onion. Why? Well, this is beacuse of differentation which was when the Earth was forming the denser materials sank to the center. This is why we have compositional zones.=

==Crust: This is the thinnest layer and the top most layer it is rich in oxygen and silicon and has rockes such as granite ( continental crust ) and basalt ( oceanic crust ). The crust is about 80 kilometers deep and is less than 1/3 of the volume of the Earth. There are two types of crust, oceanic crust which is newer and comes from sea floor spreading and is 5- 10 kilometers deep on the other hand continental crust is older and 40 to 80 kilometers deep.== ==Mantle: The mantle is under the crust and goes from those 80 kilometers to about 3,000 kilometers. It is seperated in two layers upper and lower mantle, the upper mantle ends at about 660 kilometer and the lower is from the 660 to about 3,000. There is a difference between upper and lower mantle because the upper mantle is more plastic-like and so is given its own layer. It is rich in magnesium and takes up the largest volume of the Earth about 2/3 Earth's volume.== ==Inner and Outer Core: These two cores are the last layers of the compositional zone. Theyare in the middle of our Earth and our rich in iron and nickel which are very dense the only difference between them is that the outer core is liquid beacuse of the immense heat and pressure and the inner core is solid because it is very hot and under even more pressure since it is directly in the middle. The core is about 1/3 the volume of the Earth so is second to the mantle but has more volume than the crust.==

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