Erg Chebbi offer camel trips into the dunes, taking tourists on overnight trips to permanent campsites several kilometres into the erg, and out of sight of the hotels. Erg Chebbi's proximity to the tourist center has led to the erg sometimes being referred to as "dunes of Merzouga." During the warmest part of the year, Moroccans come to Erg Chebbi to be buried neck-deep in the hot sand for a few minutes at a time. This is considered to be a treatment for rheumatism. Erg Chebbi Erg Chebbi () is one of Morocco's several ergs – large seas of dunes formed by
ERG theory a lower category need. For example if self-actualization or self-esteem is not met then individuals will invest more effort in the relatedness category in the hopes of achieving the higher need. This theory was published originally in "Organizational Behavior and Human Performance". ERG theory ERG theory is a theory in psychology proposed by Clayton Alderfer. Alderfer further developed Maslow's hierarchy of needs by categorizing the hierarchy into his ERG theory (Existence, Relatedness and Growth). The existence group is concerned with providing the basic material existence requirements of humans. They include the items that Maslow considered to be physiological and safety