system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can you grow plants hydroponically but if plants in soil get too much water they get root rot and die?
gpt
Plants’ roots need oxygen, as counterintuitive as that seems.

In soil, there are a lot of tiny gaps that hold air. When you over water a plant those gaps stay filed with water instead of air and the plant drowns

Any hydroponic system includes a way to get oxygen to the roots. Sometimes they leave the roots exposed to the air for a while (ebb and flow), or sometimes they pump air into the water like in an aquarium (deep water culture)