<span>Cataracts (the white water rapids of the Nile) prevented potential invasions using the River Nile--but they also kept Egyptians from getting very far. The cataracts harmed the Egyptians because it held back ships that tried to move though the River Nile.</span>
to raise awareness and try to bring different ideas into the world/society. Also to communicate with indivisuals.
The secret service, which is a federal policing agency that was part of the department of Treasury. At least until 2003, when is became the department of Homeland Security.
I sure don't have time to write an essay! But the first one sounds alright.
One of the early Chinese civilizations was located between the two main rivers, (google them for more details) Anyways, unlike most of China, the plain between the two rivers is fertile, allowing the people to grow rice and other foods. Along with that, I am certain that they had mountains and deserts to the west. If they could be used against natural disasters (I doubt they'd come in west) it'd be helpful! Good day