Flat Dimensions:
Modeled after the "Overworld" superflat preset; all the land is capped at sea-level. Foliage1, ores, rivers, and oceans still generate like normal.
Flat Dimensions with Caves:
Simply adds Caves to the Flat Dimensions datapack.
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Foliage means the grass, trees, plants, and flowers that would normally generate in a world. In Minecraft though, these are called "features" and also include lava pools, spawners, geodes, fire patches in the nether, etc. ↩