sentences: if a metals with a certain public contains more / more of something than a heat with a different property, then that public positively / negatively catch how want of that something that habitat contains
docs: metals is stronger_than_others. metals has relatively_little_electrical_resistance_to_electricity too_much_sun is bad_thing. mercury is toxic_substance. sediment is substance. mercury is heavy_metal. element is substance. metals is weaker_than_others. metal is heavier_than_water.