Which substance accounts for nearly 80 percent of earth's atmosphere?
a. oxygen
b. nitrogen
c. carbon dioxide
d. argon

What can be found in the ionosphere

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?

Which of the following units is not an official si unit? mole liter kilogram ampere