{
  "elements": [
    {
      "key": "minecraft:nether_cave",
      "weight": 0.05
    },
    {
      "key": "minecraft:cave",
      "weight": 0.5
    },
    {
      "key": "minecraft:cave_extra_underground",
      "weight": 0.5
    },
    {
      "key": "minecraft:canyon",
      "weight": 0.5
    }
  ]
}