Atmosphere, where the ozone and all the gases we breath are.
Magnetosphere is part of the magnetic field that Sheilds us from the suns harmful gamma radiation
Also The Planet That hit earth was named Theia. If Theia didn’t hit Earth; Earth would not have a strong enough magnetic field to have an atmosphere. With out an atmosphere, as u said, we would die.
Outer mantle is where most of the metals sit and also helps the tectonic plates move by its convection currents ( which are like a lava lamps flow ). It also helps make new parts of the crust!!
The crust is where we live on. Super thin compared to all the other layers but is made up of rocks...
The earth is made of 3 sections, inner mantel, outer mantel and the crust. Inner mantle is where the magnetic field is made; mostly made out of nickel and iron. The pressure inside the earth in that depth makes the core into a semi-solid object ( so it’s in-between liquid and the solid state)
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