The answer is respiration.
Typically higher than a clear night
Nitrogen fixation is the process where atmospheric nitrogen is converted by bacteria into biologically usable forms.
plant can not take nitrogen directly from the leaves.
Try to keep your skin mosturized as much as you can, but in general you can't really prevent it because its just dead skin. it happens to everyone.
When charged particles from the sun strike atoms in earth's atmosphere, it causes electrons to move to a higher energy state. When the electrons drop back to a low energy state they release light photons. This is what causes the Aurora lights