Final answer:
Without access to the specific reading materials, we cannot list the six regions of South America mentioned. However, the student is advised to review their text, looking for regional divisions based on physical and human factors.
Step-by-step explanation:
The question pertains to summarizing the main physical features and characteristics of South America. The relevant sections from the reading materials suggest focusing on the identification of regional characteristics like climate, vegetation, language, trade networks, political units, river systems, and religion. When asked to list the six regions mentioned in a reading we do not have access to, it is important to remind the student that this information is dependent on the specific text they are using in their course.
While we cannot provide the exact regions without access to their material, we can guide them on where to find this information in their reading materials such as 'Physical Geology' by Steven Earle, which often divides continents into geographical and cultural regions based on a variety of physical and human factors.