National Trust for Places of Historic Interest or Natural Beauty | American Museum of Natural History | Natural History Museum | natural history | Field Museum of Natural History | natural gas | Natural environment | National Museum of Natural History | Natural history | Swedish Museum of Natural History | Natural History | Carnegie Museum of Natural History | Natural Resources | Natural England | The Natural | Natural satellite | natural | Peabody Museum of Natural History | Natural Resources Defense Council | Natural Resources Conservation Service | Natural History (Pliny) | natural environment | Bombay Natural History Society | phenol | Oxford University Museum of Natural History | natural language processing | Natural History Museum of Los Angeles County | Natural Born Killers | The Natural (film) | San Diego Natural History Museum |
Decomposition of dead plant material causes complex organic compounds to be slowly oxidized (lignin-like humus) or to break down into simpler forms (sugars and amino sugars, aliphatic, and phenolic organic acids), which are further transformed into microbial biomass (microbial humus) or are reorganized, and further oxidized, into humic assemblages (fulvic and humic acids), which bind to clay minerals and metal hydroxides.