{
  "format_version": "1.13.0",
  "minecraft:biome": {
    "description": {
      "identifier": "birch_forest_hills_mutated"
    },
    "components": {
      "minecraft:climate": {
        "downfall": 0.8,
        "snow_accumulation": [ 0.0, 0.125 ],
        "temperature": 0.7
      },
      "minecraft:overworld_height": {
        "noise_params": [ 0.55, 0.5 ]
      },
      "minecraft:surface_parameters": {
        "sea_floor_depth": 7,
        "sea_floor_material": "minecraft:gravel",
        "foundation_material": "minecraft:stone",
        "mid_material": "minecraft:dirt",
        "top_material": "minecraft:grass",
        "sea_material": "minecraft:water"
      },

      "animal": {},
      "birch": {},
      "forest": {},
      "hills": {},
      "monster": {},
      "mutated": {},
      // "overworld" tag cannot be present in order to match legacy behavior, but is
      // required for correct world generation -- hence: overworld_generation
      "overworld_generation": {}
    }
  }
}