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PA Envirothon - Soils, PA Envirothon Soils Latest Update Graded A+
- Vak
- Instelling
PA Envirothon - Soils, PA Envirothon Soils Latest Update Graded A+ O horizon The top horizon, made up of a little soil and mostly humus (leaves, sticks, organic matter, etc.), above the A horizon, called humus A horizon The second soil layer, made up of humus mixed with mineral particles, t...
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