system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: So there are waterfalls, right, and rivers that move downstream from higher places. My question is, how do mountains keep that much water supply for the waterfalls and rivers to continuously flow downstream? Is it possible that it all just comes from rain?
gpt
Yes it comes from rain, and seasonally from melting snow. You have to keep in mind that large rivers are draining rainwater from areas tends of thousands of square miles in area. Most of the continental U.S.drains into the Mississippi, for example.