chemical weathering means rocks weathering because of chemical reactions
camp_production is chemical_reaction. weathering is not physical_event. carbon_fixation is chemical_reaction. snowing is not precipitation_process. weathering is physical_event. phosphate_weathering is erosion. carbon_fixation is not chemical_reaction. phosphate_weathering is not erosion. chemical_decomposition_of_camp is chemical_reaction. chemical_decomposition_of_camp is chemical_decomposition.