| living machine(noun, expression, feature, environment, science) |
| mass wasting(noun, expression, feature, environment, science) |
| microbial biodegradation(noun, expression, feature, environment, science) |
| microbial ecology(noun, expression, feature, environment, science) |
| mound system(noun, expression, feature, environment, science) |
| night soil(noun, expression, feature, environment, science) |
| nonpoint source pollution(noun, expression, feature, environment, science) |
| nutrient pollution(noun, expression, feature, environment, science) |
| pilot polder andijk(noun, expression, feature, environment, science) |
| prairie restoration(noun, expression, feature, environment, science) |
| riparian buffer(noun, expression, feature, environment, science) |
| salt marsh dieback(noun, expression, feature, environment, science) |
| sand fence(noun, expression, feature, environment, science) |
| savory brittleness scale(noun, expression, feature, environment, science) |
| sediment basin(noun, expression, feature, environment, science) |
| sediment control(noun, expression, feature, environment, science) |
| septic drain field(noun, expression, feature, environment, science) |
| sewage treatment(noun, expression, feature, environment, science) |
| silt fence(noun, expression, feature, environment, science) |
| slow sand filter(noun, expression, feature, environment, science) |