Cloud service providers invest in the necessary infrastructure and management systems, and in return receive a time-based or usage-based fee from end users [17]. Cloud computing is emerging today as a commercial infrastructure that eliminates the need for maintaining expensive computing hardware.
Area: 9,400,000 sq.km. Population: 2.5 million people. Population density: o.4/sq. km or less than 1 person per sq mi. Sahara is the largest non-polar desert and the hottest of the sub-tropical deserts in the world. The desert can be estimated nearly as large as USA or China. Sahara covers most of the north-Africa under its belt by bordering with Red Sea, touching Mediterranean coasts to Atlantic shelves.
2) Arctic Desert. Arctic desert is the second largest desert of the world. This is also a type of cold desert. the area of Arctic Desert is about 62300 sq.mile. This desert is located in Alaska ,Canada ,Finland ,Greenland ,Norway and Sweden.)Antarctic Dessert. Antarctic Dessert is the largest desert of the world. The area of this desert is about 14,245,000 square kilometers. The land surface of this desert is covered by snow all the time that is the reason due to which geologists called it cold desert. This is the one of most highest place of our earth.