Earth Science — Soil Horizons

Layers of a soil profile.

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digraph Soil {
  rankdir=TB;
  node [shape=box, style=rounded];
  "O horizon (litter)" -> "A horizon (topsoil)";
  "A horizon (topsoil)" -> "B horizon (subsoil)";
  "B horizon (subsoil)" -> "C horizon (parent material)";
  "C horizon (parent material)" -> "Bedrock";
}