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.
In terms of sheer size, the Antarctic Desert is the largest desert on Earth, measuring a total of 13.8 million square kilometers. Antarctica is the coldest, windiest, and most isolated continent on Earth, and is considered a desert because its annual precipitation can be less than 51 mm in the interior.