Why was the nile river valley good for farming?

the answers are
a it contained slat water
b it regularly deposited silt
c it flowed to the south
d it contained very few fish

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste