system
Given the following post, respond as if you're commenting on Reddit:
human
[Spongebob] How did Sandy Cheeks get her tree dome down to bikini bottom from the surface?
gpt
It's actually more of a bowl shape, since the underside has land plants. The glass done continues underground and is entirely sealed. It contains the earth underneath the grass and trees, otherwise the plants wouldn't be able to grow at all, since saltwater would get in and oak trees generally don't like that much salt. 

The whole thing was probably lowered from a barge, come to think of it.