Which eruption or volcano type is likely to produce the most violently ejected pyroclastic fragments?
Stratovolcano
The Inca used those metals to decorate their palaces and had silverware, cups and dishes made of them.
Of course, only royalty had that.
The answer is - it can not be taken out of the atmosphere.
The nitrogen, even though makes for about 78% of our atmosphere, and is by far the most abundant gas in it, we can not use it because it can not be taken out of the atmosphere as it is. If we take nitrogen in the form as it is in the atmosphere it is useless for both, humans and plants. It has to go through a process of ''fixation'' first before we can actually use it in our food.
