{
  "format_version": "1.13.0",
  "minecraft:feature_rules": {
    "description": {
      "identifier": "minecraft:overworld_underwater_magma_feature",
      "places_feature": "minecraft:underwater_magma_underground_feature"
    },
    "conditions": {
      "placement_pass": "after_surface_pass"
    },
    "distribution": {
      "iterations": "Math.Random(18, 30)",
      "x": {
        "distribution": "uniform",
        "extent": [ 0, 16 ]
      },
      "y": {
        "distribution": "uniform",
        "extent": [ -64, 120 ]
      },
      "z": {
        "distribution": "uniform",
        "extent": [ 0, 16 ]
      }
    }
  }
}