Volcanoes and Volcanic Eruptions. Magmas and Lava. Since volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth's surface, we'll first review the characteristics of magma that we covered previously. Three basic types of magma: Mafic or Basaltic-- SiO2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na.
EMEA: Europe, the Middle East and Africa, marked on a worldmap. EMEA (or EMEIA if India is included), is a shorthand designation meaning Europe, the Middle East and Africa. It is used by institutions, governments as well as in marketing and business. It is particularly common among North American companies. The region is generally accepted to include all European nations, all African Nations, and extends east to Iran, but including Russia. Typically this does not include independent overseas territories of mainland countries in the region, such as French Guyana.
The Indian Railway Service of Electrical Engineers (IRSEE) is a prestigious Group A central service of the Government of India.The officers of this service are responsible for managing the Electrical Engineering Organisation of the Indian Railways.The Indian railways have technical and non-technical departments for its operation and management which form the base structure on which the railways function.he recruitment to the cadre is done through the Engineering Services Exam, conducted by the Union Public Service Commission (UPSC) of India. The UPSC is responsible for recruiting middle and top-level bureaucrats for the Government of India.