sentences: if something causes something else then that something contributes to the formation of that something else
docs: planting_field is unnatural_thing. sending is causing. change is when_one_thing_becomes_another_thing. space is what_between_else. triggering is causing. developing_product is unnatural_thing. spreading_stuff_onto_surface is spreading. formation is creating_by_mental_acts. puttingsomethingintosomethingpartway is putting_into_else. planting is putting_into_else.