Issaouane Erg confined to basins. Sand in the Issaouane Erg, below the level of the sand dunes, has accumulated to a depth of 20 to 30 meters. It has barchan dunes as well as star dunes of 300 to 430 meters high. The presence of both barchan dunes (which form due to unidirectional winds) and star dunes (which form when winds from various directions deposit sand) "suggests that wind regimes have changed over time". NASA's "Earth Observatory" notes all three types of erg dunes are present in the photos of the Issaouane Erg taken from the International Space Station: stationary mega dunes,
Is Geography Destiny? and Portuguese. Is Geography Destiny? Is Geography Destiny? Lessons from Latin America is a book written by John Luke Gallup, Alejandro Gaviria, Eduardo Lora and published by the Inter-American Development Bank (IDB), which documents an advanced step of the rediscovery of geography by economists initiated by Paul Krugman in the early 1990s, however in another, more deterministic direction. Inspired by the works of David Landes, Jared Diamond and Jeffrey Sachs, considered as “champions of the rediscovery of geography”, the book is the result of “a series of studies on the influence of geography on Latin American development”. It is part