Our earth is made up of several concentric layers with one inside another. These layers are three in number—crust, mantle smd core. Crust. It is the uppermost layer over the earth’s surface. It is the thinnest of all the layers. It is about 35 km on the continential masses and only 5 km on the …
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Rocks are of the three types: Igneous rocks Sedimentary rocks Metamorphic rocks Igneous rocks. When the molten magma cools, it becomes solid. Rocks formed in this way are called igneous rocks. They are also called primary rocks. They are of two types—intrusive rocks and extrusive rocks. Extrusive rocks.When molten lava comes on the earth’s surface, …
Minerals are naturally occurring substances which have certain physical properties and definite chemical composition.Minerals are very useful for mankind. Some minerals like coal, natural gas and petroleum are used as fuels. They are also used in industries. Iron, aluminium, gold, uranium etc. are used in medicine, in Fertilizers, etc
They change into metamorphic rocks.
The remains of the dead plant and animals trapped in the layers of rocks are called fossils.
When the molten magma cools, it becomes solid. Rocks formed in this way are called igneous rocks.
It is made up of different types of rocks.
The main constituents of the core are nickel and iron. It is usually known as nife.
The radius of the core is about 3500 km.
Silica and magnesium.
