Liquids flow because its particles can move over each other. The particles have freedom to move and they will keep moving until it takes the shape of its container.
Solid particles are rigid and tightly packed, they cannot move, so it does not flow.
Troposphere, this is the layer of the atmosphere closest to the earths crust.
N, our atmosphere is about 80% nitrogen(N) and about 20% oxygen(O)
Answer: Nucleus
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