Rivers typically come from underwater springs. They can also form from mountains and hills from melted snow.
Answer:
The crust is made of solid rocks and minerals. Beneath the crust is the mantle, which is also mostly solid rocks and minerals, but punctuated by malleable areas of semi-solid magma. At the center of the Earth is a hot, dense metal core.
Major Pre-Columbian Indian Cultures in the United States. They are associated primarily with the Great Plains area. Major canals were over 30 miles long. Highland farmers but also hunters in what is now eastern Arizona and southwestern New Mexico. Their descendants are the Hopi and other Pueblo Indians. I hope that this is the answer that you were looking for and it has helped you.