The Tigris provided fresh water in order to grow crops they created things called leeves that transport water to supply it. The eurphrates did the exact same thing they provided water for the crops. Hope this answered your question.
1. The main point of the excerpt is that the states are in a contract with the federal government and can cancel or ignore measures used that are in violation of that contract. Essentially the states are allowed to ignore laws, like the Alien and Sedition Acts, when the states believe they violate their rights.
2. Because the Alien and Sedition Acts put a watch on anyone new to the country under the Alien Act and the Sedition Act allowed the government to arrest people if they spoke against the government. These acts allowed the government to violate rights granted under the Constitution.
3. Because accepting the acts would be a violation of the highest laws of the land. It would be the governments willingly violating the rights of the people and allowing the federal government to have power larger than granted to them under the Constitution.
The correct answer to this open question is the following.
The information that is needed to investigate and describe a region by its geographic characteristics is the following.
What we need to describe a region geographically speaking is to know the weather of the region, the altitude which is the elevation above sea level, land formation, or mountain chains if it has some, the type of soil, and the plants and trees that grow in the region, and the wildlife. We can search for geological characteristics, as well as atmospheric and hydrological means to know more about the geography of the place.