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,
Influence of Arabic on other languages Examples are "information" to mean the imparting or acquisition of knowledge (Arabic "taṣawwur", mental impression or representation, from a root meaning "form") and "intention" (Arabic "manā", meaning). These words may almost be regarded as calques. French is widely spoken as a second language in France's former colonies in the Maghreb. Therefore, the list of words that are used or incorporated into the French spoken in this region (as a result of code-switching, convenience or lack of an equivalent term in standard French) is potentially endless. Such arabisms, are accepted within the local context but would not normally be known by