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  • Inside of earth Interior of the earth.

  • The earth our home planet is a dynamic planet that undergoes lots of changes inside and

  • outside especially the deepest interiors. The earth is made up of several concentric

  • layers with one inside the other. The outer most layer is the crust, which is the thinnest

  • of all layers with a thickness of 35 km on the continental masses and 5 km on the oceanic

  • floors. The main consistent of the continental masses is the silica and aluminum which is

  • also referred as SILA where as the oceanic crust mainly consists of silica and magnesium

  • and is therefore called as SIMA. Beneath the crust there is a 2nd layer, the

  • mantle which extends up to a depth of about 2900 km and a radius of about 3500 km.

  • The minerals that are mostly found in this layer are Nickel and ferrous which account

  • for very high temperature in the interiors of the earth

  • Rocks and minerals A natural mass of mineral matter that constituents

  • the earth crust consists of rocks of different colours, sizes and textures.

  • There are three major types of rocks 1. Igneous

  • 2. Sedimentary 3. Metamorphic

  • The formation of these igneous rocks or primary rock as they are also called occurs when the

  • molten magma cools and becomes solid. There are two types in these igneous rocks. They

  • are Intrusive and extrusive rocks. The lava which is fiery molten magma that comes out

  • of the volcanoes become hard when it touches the crust forming extrusive igneous rocks.

  • They have a very fine grained structure. One the example is Basalt. The deccan plateau

  • is primary made up of basalt rocks. when the magma cools down inside the crust,

  • really hard and solid rocks are formed which are called intrusive igneous rocks. An example

  • of this type of rock is granite which is used to make grinding stones.

  • Sedimentary rocks are formed by a process when rocks roll down and hit other and crack

  • forming sediments. These sediments are transported and deposited by wind, water etc. They are

  • in the form of layers of rock called the sedimentary rocks. Sandstone is formed by these grains

  • of sedimentary rocks. Under great heat and pressure the sedimentary

  • and igneous rocks are transformed into Metamorphic rocks just the way in which clay changes into

  • slate and slate into marble. Rocks as we all know are used to make roads, buildings and

  • houses. You can look around you and see the different types, shapes and sizes of rocks.

  • As we learnt before, rocks changes its types under external conditions and this process

  • of transformation is called the rock cycle. The first step of the cycle starts when molten

  • magma cools and solidifies into igneous rocks. Next when these igneous rocks are broken down

  • they transform into sedimentary rocks. The cycle continues till igneous and sedimentary

  • rocks that are subjected to heat and pressure change into metamorphic rocks. If these metamorphic

  • rock continue to be under heat and pressure, they melt to form molten magma thus completing

  • the rock cycle. Rocks also constitute minerals which are naturally occurring substances of

  • different physical properties and definite chemical structure. They are used as petroleum,

  • gas, aluminium, granite etc

Inside of earth Interior of the earth.

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