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,
What Love Is Made Of Katy released her debut album, entitled "On a Mission", by Rinse and Columbia Records. Exploring dubstep-based musical genres, it garnered critical praise, including being nominated for the Mercury Prize. In the UK, it was a commercial success, peaking at number 2 in the UK. Following that release, was the extended play (EP) "Danger", which was available online in December 2012. During an interview with "Billboard" held in March 2013, Katy revealed that her sophomore studio album was nearly done. Katy revealed to MTV UK website District MTV that she felt inspired to record "What Love Is Made Of" by hearing