A cataract is an area of a river where the elevation of the streambed changes too quickly or has to many boulders meaning people couldn't use part of the river as transportation.
This was a good thing because the cataracts effectively served as barriers so they could control travel. This meant that the Pharos found it impossible to control the land south of the first cataract. This ending up becoming the southern border of Ancient Egypt.
Hope this helped ☺️
The Establishment Clause or the Religion Clause is the first of several pronouncements in the First Amendment to the United States<span> Constitution, stating,</span>Congress shall make no law respecting an establishment of religion<span>, or prohibiting the free exercise</span>
I believe the final answer is correct. Water is a desert's scarcest recourse. <span />