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.
Determining the number of languages spoken in Africa can be complex, mostly because it can be difficult to determine whether two languages are distinct or simply dialects of the same language. Still, many agree that the number lies around 2,000. Some of the more common include Hausa, Swahili, and Yoruba.he Niger-Congo language family is comprised of the greatest number of languages spoken in Africa. This family has almost 400 languages and is spoken by more than 500 million people.