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Earth doesn't have only 3 layers , it has more but do you know that why only 3 are important ? I will tell you, it is so because, because of these three continents are made and scientists were able to know that when earth was made.

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Many scientists believe that the Earth and its Solar System formed about five billion years ago from a huge cloud of dust. Over time, the cloud shrank. Parts of the cloud began spinning, eventually forming a star, the Sun, then the planets, moons, and countless asteroids and comets. Earth is the largest of the rocky planets. Using instruments such as the seismograph, scientists have discovered that as Earth slowly cooled, it formed three major layers. Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the surface resulting in three layers of the earth.

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Earth comprises four separate layers. Most of the geologist believes that as the Earth cooled, the heavier and the denser material sank into the centre, and the lighter ones rose towards the top.

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In my opinion because of the big bang theory it happen.

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ANURAN BERA, VII-E
The  Earth  has  the inner  core ,outer core,mantle and crust which  are  responsibl  responsible  for the formatio  of our formation   continents.  The Earth 's interior  is  the  basis  for  geology. If  we recall from the  plate tectonics section,Earth  exists  as we see it  today  because  of  plate  tectonics. Studying  the  interior of the  Earth  helps  learn about  all of  these  and the  processes  that  helped  create the  Earth  and  currently  drive plate  tectonics.

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There are 3 layer the inner core, the outer core mantel and crust which only helps in forming the earth and make it a live able planet. They only make the continents because of volcanic eruption, earthquake ETC. Ocean floors are also made by them. In the mantle layer there are 3 types of rocks which are useful like metamorphic rock make different types of marble.

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The three layer of the earth are crust ,meantle and core there are 4 layer

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The three layer of the earth are crust ,meantle and core there are 4 layer

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According to what I understood is according to the properties of the range it is divided into layers. Like mantle is rocky so the range mantle has in that range the surface is rocky.
CRUST: HARD
MANTLE: ROCKY
CORE: VERY HOT.  AND NOW NOTHING IS LEFT TO BE DIVIDED.

VII E

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I think so that earth has 3 layers because in every layer there would be specfic type of rock in each layer and the scientist would do not end a layer until a specfic group of rock do not stops coming in the layer .

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Once the temperature of the Earth was hot enough to form molten iron, the iron was pulled inward by gravity. As this happened, the less dense silicate minerals moved upward

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Once the temperature of the Earth was hot enough to form molten iron, the iron was pulled inward by gravity. As this happened, the less dense silicate minerals moved upward

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Eeshanee

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Earth's interior is generally divided into three major layers: the crust, the mantle, and the core. ???????? The outer core is molten and liquid iron and nickel, while the inner core is solid and much more dense than either iron or nickel at the surface

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I think that the earth has only 3 layers because the layers of the earth are Crust, Mantle and Core and each one of them has the same minerals compared to the other ones like crust have Sima and Sial as the minerals the other would have there own specific minerals and the last layer, the core is divided into two categories- Outer Core and Inner Core as they both have the same substance and minerals but the temperature of both of them is different.

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We have the inner core, outer core, mantle and crust which play an important role on Earth. The layers of the Earth are responsible for the formation of our continents.

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The Earth's atmosphere is made up of gases. It is less dense than the Earth's crust, which is a solid. This is why the Earth's surface and atmosphere form distinct layers.
and i think that if there will be no layers of earth so we cant live because of the lava and if we will not have the three layers and there we also get dimonds, gold and etc.