They created under-water pipes to collect water from floods, and to lead up to crops
The form of energy would be C)Geothermal energy. Geothermal energy is heat within the earth so people can use this heat as steam or hot water to heat buildings and generate electricity
This is a true statement!
For example, the biggest city in the Sahara (admittedly placed on the edge of it, on the Atlantic coast) is Nouakchott, the capital of Mauritania - it has 1 million people, so a great portion of the 2.5 million.
Another big city is Ghardaia in Algeria - of 100 000 people.
A. tien shan mountains
im not sure but i hope it’s right =]