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.
When Russia illegally annexed Crimea and started interfering in Eastern Ukraine, the West responded with economic sanctions. In July 2014, sanctions were enacted in a coordinated manner by the European Union, the United States, Canada, and other Allies and partners.