These are called "farms"

Captain: [AUTO appears near the captain] AUTO! Earth is amazing! These are called "farms". Humans would put seeds in the ground, pour water on them, and they grow food - like, pizza!

Captain: This is called farming! You kids are gonna grow all kinds of plants! Vegetable plants, pizza plants.

[laughs]Captain: Oh, it's good to be home!

Wall-E, think