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.
Initially the UN Security Council imposed stringent economic sanctions on Iraq by adopting and enforcing United Nations Security Council Resolution 661. After the end of the 1991 Persian Gulf War, those sanctions were extended and elaborated on, including linkage to removal of weapons of mass destruction, by Resolution 687.