The mantle is the layer of the Earth that composes about 80% of the lithosphere's volume. It is a solid layer of rock that lies beneath the Earth's crust and extends down to the outer core. The lithosphere, which includes the crust and uppermost part of the mantle, is broken into tectonic plates that float on the semi-fluid asthenosphere below.
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Magnesium makes up about 2% of the Earth's crust by volume. It is the eighth most abundant element in the Earth's crust.
Nitrogen and oxygen comprise 99 percent of the volume of the Earth's atmosphere.
The approximate percent of oxygen in Earth's lower atmosphere is around 20.95% by volume.
This passage comes from wikipedia. The mantle is ... about 2,970 km thick (~1,800 mi) rocky shell that constitutes about 84 percent of Earth's volume. It is predominantly solid and takes over Earth's iron-rich hot core, which occupies about 15 percent of Earth's volume
No, nitrogen makes up about 78% of the Earth's atmosphere by volume.