To become an operative part of the Constitution, an amendment, whether proposed by Congress or a national constitutional convention, must be ratified by either: 1  The legislatures of three-fourths (at present 38) of the states; or. 2  State ratifying conventions in three-fourths (at present 38) of the states.
But more of that in a second. The Earthâs atmosphere is composed of the following molecules: nitrogen (78%), oxygen (21%), argon (1%), and then trace amounts of carbon dioxide, neon, helium, methane, krypton, hydrogen, nitrous oxide, xenon, ozone, iodine, carbon monoxide, and ammonia.
Diagram of Titan's atmosphere. The atmospheric composition in the stratosphere is 98.4% nitrogen âthe only dense, nitrogen-rich atmosphere in the Solar System aside from the Earth'sâwith the remaining 1.6% composed of mostly of methane (1.4%) and hydrogen (0.1â0.2%).