system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does the ocean stay salty?

With rain and all the freshwater rivers flowing into the ocean, how does it maintain a similar level of saltiness? Should't it be getting less salty over time?
gpt
Rivers pick up small amounts of salt on their way to the ocean, but mostly it's a matter of the water cycle. The amount of fresh water flowing in to the oceans and diluting them is balanced by the amount of water evaporating from the ocean (salt doesn't evaporate, so this concentrates salt in the oceans).

Over time the two forces balance each other pretty well.