Question

the mound builders
anyone who traveled up the mississippi river 900 years ago would have seen, looming in the distance, a four - level mound of earth, built by human hands, that was bigger than egypt’s great pyramid. around this huge mound stood more than a hundred smaller mounds, some topped with walls of wooden poles. canals for irrigation and transportation threaded among fields of maize. wooden houses were covered with red and white plaster. flags of painted animal skin flapped everywhere. this splendid sight was cahokia, home to at least 15,000 native americans.
cahokia stood near the present - day site of st. louis, missouri. in the eighteenth century it was the largest settlement north of the río grande, and it was also part of a long tradition of mound building in the eastern half of north america. over thousands of years, societies along the mississippi and the rivers that flowed into it, and some in the southeast, constructed tens of thousands of mounds across the land.
make a list of the different structures that the mound builders built. write at least three different structures
1)four level mound of earth
2)mounds topped with walls of wooden poles
...

Explanation:

To answer this, we analyze the text about the Mound Builders (specifically Cahokia and related Native American mound - building societies) to identify the structures they built:

1. From the first text box, we learn about a "four - level mound of earth" that was constructed by human hands and was larger than Egypt's Great Pyramid.
2. Also in the first text box, there are "mounds, some trapped with walls of wooden poles" and "canals for irrigation and transportation among fields of maize".
3. The text also mentions "wooden houses covered with red and white plaster" and "flags of painted animal skin flapped everywhere" as part of the settlement, but focusing on mound - related or major structures, we can also consider the overall settlement structures like the houses and the extensive mound network. But for the three main mound - related or key structures:

• Four - level mound of earth: This is a prominent earthen mound structure built by the Mound Builders.
• Mounds topped with walls of wooden poles: These are smaller mounds with additional wooden pole wall structures.
• Canals for irrigation and transportation: These are water - based structures built for practical purposes related to the mound - built settlement.
• Wooden houses (covered with plaster): Part of the settlement built by the mound builders.
• The extensive network of mounds across the Southeast (tens of thousands of mounds): A large - scale structure of mounds.

We can choose three from these. For example:

1. Four - level mound of earth
2. Mounds topped with walls of wooden poles
3. Canals for irrigation and transportation

Answer:

1. Four - level mound of earth
2. Mounds topped with walls of wooden poles
3. Canals for irrigation and transportation