sentences: if something is formed from something else over a very long period of time, then that something else existed a very long time ago
docs: thing is substance. hijacking is unnatural_thing. people has hard_time_explaining_existence geological_formation is tangible_thing. trying_to_steal_information is unnatural_thing. change is when_one_thing_becomes_another_thing. space is what_between_else. earth is thing. naturally_occurring_tangible_substance is tangible_thing. universe has everything_exists