system
Given the following post, respond as if you're commenting on Reddit:
human
Why is there so much salt in the oceans and seas? How did it get there?
gpt
The salt in the ocean is basically minerals washed out of rocks from rain, rivers and the ocean ground itself. It concentrates more and more because evaporated water leaves the salt back, builds clouds, and if those clouds happen to rain over mainland, the water washes even more salt to the ocean.