Question

Which gas is most important for understanding the processes that take place in the atmosphere? a.nitrogen b.oxygen c.carbon dioxide d.water vapor

Answer 1

They are all important. They all have a particular cycle and impact.

Explanation:

There are many "processes" in the atmosphere! Which one you want to study will affect which gas has the largest impact. Water has more impact on storms and general climate. Oxygen is the most active and is continually changing, but may be considered to impact terrestrial processes more than atmospheric ones. Carbon dioxide affects the thermodynamics overall, but only really affects ONE atmospheric "process".

All that can really be said about that list and atmospheric processes is that nitrogen is probably the least active of the four.