The biggest doubling time of all the regions/continents in the world has Europe.
Europe is the only continent that has almost 0% population growth (as of 2014), which practically means that with this pace Europe will need an eternity to be able to double its population, so it makes it the continent with the biggest time needed to double it's population.
When the tectonic plates diverge apart new magma comes up and cools along the ocean floor. This makes new crust.
It is in the desert of Asia it is the largest contigous sand desert in the world
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