How the Earth is made up of ?

Dear Student,
The following points may help you:
a.) There are many theories attached with the formation of Earth.
b.) It is believed that Earth was formed
 in a nebula, which is a large cloud of light gases like ,dust hydrogen, helium and other ionised gases. As these gases began to fall into the centre and compressed due to their own gravitational pull , it produced tremendous amount of heat and pressure causing nuclear fusion leading to the birth of sun, stars and planets .The Big Bang theory also explains the possible formation of Universe.
c.) Earth is made up of several layers.The Earth's core is composed of nickel and iron, the mantle is made up of rock containing different minerals. The crust is mostly made up of oxygen, silicon, iron, potassium and magnesium. The Earth's surface is covered with liquid water and the atmosphere is primarily made of nitrogen and oxygen, with little amounts of carbon dioxide and other gases.
d.) At the same time there are a lot of hypothesis and theories attached with origin of water on Earth.
e.) Scientist have argued on many bases like water rich comets, meteorites collided with Earth million of years ago, leading to origin of water.
f.) It is also argued that water may also come from volcanic eruption.
g.) Some suggest that Earth had water when it was formed.



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Dear student, Earth is composed of four main layers, starting with an inner core at the planet's center, enveloped by the outer core, mantle and crust. The inner core is a solid sphere made of iron and nickel metals about 759 miles (1,221 kilometers) in radius. Regards...

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