2.+What+are+the+main+layers+of+the+earth?

//**  What are the main layers of the Earth? **//
 * The planet Earth was made about 4.5 billion years ago, after a collapse of the supermassive gaseous body. As time passed, the earth started to cool down and it is still cooling as of today! ****Earth has several layers starting with the earth’s surface, there are 4 main layers of earth the crust, the mantle, the outer core, and the inner core. The pressure and the temperatures increase mainly from the Outer and Inner layer. **



===**The Crust: Is the outer layer of the earth, it’s made up of silicate rock materials. The Crust takes up about 1% of the earth but is the thinnest compared to the other three layers. Most of the earthquakes occur in the earth’s crust. **===

===**The Mantle: Is the thick layer of the earth, made up of hot solid rock between the Crust. The temperature in this layer is estimated to be about 100 Degrees Celsius. The mantle is divided into the upper and lower sections; the upper mantle is much cooler than lower section. The thickness of the mantle is 2900 kilometers. **===

===**The Outer Core: Is made out of very hot materials. The outer core is liquid and is made out of iron and nickel. The density is very high, but is less than pure molten iron. Scientists think that sulfur and oxygen may be in the outer core. The outer core measures to be 2200 kilometers thick. **===

===**The Inner Core: Is what the last layer of the earth. The temperature of the inner core is more than the sun's surface! The intense heat from the inner core immobilizes the materials of the outer core and the mantle. Due to the high pressure the inner core materials are unable to move around and just stays solid. The thickness of the inner core is to be about 1250 kilometers. **===

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