They were nomadic. They moved in search of food, resources and shelter.
Definitely not. Mount Rushmore is granite so it erodes roughly 1 inch every 10,000 years. In 500,000 years it is predicted that the face would lose some of their definition, but Mount Rushmore could last for 7 MILLION years
Because people worked six or seven days a week
The term length in the United States Senate would be "6 years," since the Founding Fathers wanted the Senators to be able to make decisions without constantly having to think about re-election.
