if something produces something else then that something is a source of that something else
base is not tangible_thing. fault is tangible_thing. change is when_one_thing_becomes_another_thing. source_materials is source. nature is not awsome_power. space is not what_between_else. source_materials is not source. change is not when_one_thing_becomes_another_thing. thing is substance. creating_from_raw_materials is not creation.