asymmetry of the oscillation causes the bed forms to shift laterally at non-negligible rates. I will unofficially term cross stratification of this kind climbing-bed-forms cross stratification. Bed forms are said to climb when there is overall aggradation of the sediment bed while the bed forms are moving; see a later section for details.) 502
Swahili is the most spoken language in Africa, with over 100 million speakers. It is a Bantu language believed to have originated from other languages, mainly Arabic, due to historical interactions between Arabs from the Middle East and East Africans.
French set to be the world's most commonly spoken language by 2050 because of soaring population growth in sub-Saharan Africa. 1  Study says 750 million people will speak French as first language by 2050.  It is spoken in sub-Saharan Africa, one of the fastest growing-populations in the world.