{
  "feature": {
    "type": "minecraft:simple_block",
    "config": {
      "to_place": {
        "type": "minecraft:noise_provider",
        "seed": 0,
        "noise": {
          "firstOctave": -4,
          "amplitudes": [
            1,
            0.5,
            1.1
          ]
        },
        "scale": 1,
        "states": [
          {
            "Name": "minecraft:magma_block"
          },
                    {
            "Name": "minecraft:magma_block"
          },
                    {
            "Name": "minecraft:lava"
          },
                    {
            "Name": "minecraft:lava"
          },
          {
            "Name": "minecraft:blackstone"
          },
                    {
            "Name": "minecraft:lava"
          },
                    {
            "Name": "minecraft:lava"
          },
                    {
            "Name": "minecraft:lava"
          },
                    {
            "Name": "minecraft:lava"
          }
        ]
      }
    }
  },
  "placement": [
    {
      "type": "minecraft:count",
      "count": 8
    },
    {
      "type": "minecraft:count",
      "count": 256
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "WORLD_SURFACE"
    },
    {
      "type": "minecraft:biome"
    },
    {
      "type": "minecraft:random_offset",
      "xz_spread": {
        "type": "minecraft:uniform",
        "value": {
          "min_inclusive": -4,
          "max_inclusive": 4
        }
      },
      "y_spread": -1
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:matching_blocks",
        "offset": [
          0,
          0,
          0
        ],
        "blocks": "minecraft:lava"
      }
    }
  ]
}
