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.
The US and EU have imposed an array of sanctions on Russian individuals and businesses in response to the annexation of Crimea and the crisis in eastern Ukraine. The deaths of 298 people on board a Malaysia Airlines plane destroyed over eastern Ukraine on 17 July triggered tougher EU sanctions.