Composition of the Atmosphere extended definition. The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere.
(CNN)Iran has completed the necessary steps in a deal to restrict its nuclear program, meaning international economic sanctions are lifted, officials from the EU and the U.N. nuclear watchdog agency said Saturday. Relations between Iran and the IAEA now enter a new phase.
Why China Supports New Sanctions Against North Korea. People watch a news report showing footage of North Korean rocket launchers in Seoul on March 4. North Korean leader Kim Jong Un ordered its nuclear arsenal readied for preemptive use at any time following the U.N. Security Council's adoption of tough new sanctions on Pyongyang.