Where do metamorphic rocks come from? meteorites that strike Earth meteorites that strike Earth , ,

gaseous minerals in the air gaseous minerals in the air , ,

dissolved chemicals in water dissolved chemicals in water , ,

igneous or sedimentary rocks

confused

confused             hewdejdnjnjsnd

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest