system
Given the following post, respond as if you're commenting on Reddit:
human
When the Nile floods the silt helps crops grow, when a river in North America Floods it ruins fields. Why?
gpt
Because agriculture around the nile was timed so the floods would occur when no crops were in the ground.  On the other hand, floods in North America tend to wash over crops, drowning them.  The Nile floods were also more consistent in timing than those on the Mississippi.