Question

why was the annual flooding of the Nile river needed to grow crops

Answer 1

Answer:

Ancient Egypt could not have existed without the river Nile. Since rainfall is almost non-existent in Egypt, the floods provided the only source of moisture to sustain crops. The ancient Egyptians could grow crops only in the mud left behind when the Nile flooded. So they all had fields all along the River Nile.

Answer 2

Since crops need water to survive, the flooding of the Nile helped give water to the crops.