Why was the wide extent of the olmec trading network significant?

Why did large numbers of african migrate to the americas

Witch layer of the atmosphere has the most air pressure

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons