Color grading is the process used to change the visual tone of an image, many photographer's use this. Hope it helps!
The Mound Builders used metal tools, and were probably metal builders. Based on that information I would say the answer is B.Copper, because copper is a metal.
<span>All Native American tribes used natural pigments; the very concept of chemical pigments had not even been invented yet when Indians still roamed free. And all tribes created hand shaped pottery because they had no access to machinery to do it for them.
Southwest tribes include: Apache, Comanche, Havasupai, Hopi, Jemez, Kiowa, Lipan, Maricopa, Mohave, Navaho, Paiute, Papago, Panamint, Pecos, Pima, Pueblo, Shoshoni, Soaipuri, Tewa, Ute, Walapai, Yavapai, Yuma and Zuni
While all of them produced hand shaped pottery decorated with natural pigments, most did so for their own use within the tribe. The first and perhaps most famous of the tribes to trade heavily in pottery were the Maricopa. Others soon followed the Maricopa example such as the Navaho which became even more famous for their jewelry than their pottery.</span>
Iconography, the science of identification, description, classification, and interpretation of symbols, themes, and subject matter in the visual arts. The term can also refer to the artist's use of this imagery in a particular work.
