Chemical weathering is the process by which rocks are broken down by chemical reactions. There are different types of chemical weathering. Hydrolysis is the chemical breakdown of a substance when combined with water. The most common example of hydrolysis is feldspar in granite rocks changing to clay.
Racially Africans originated in Africa, Europeans in Europe and so on. (before that the human species originated in Africa, but that's ancient history) African Americans are an ethnic group, or a subrace of the African race.
This Site Might Help You. RE: Where did white people originate from? The Black man is originated from Africa The Asian man is originated from Asia Whites didn&#39;t originate from America, America rightfully belongs to the Native American Indians.So where did Caucasians come from?E: Where did white people originate from? The Black man is originated from Africa The Asian man is originated from Asia Whites didn&#39;t originate from America, America rightfully belongs to the Native American Indians. So where did Caucasians come from?