When iron reacts with oxygen what substance is produced?

Acontrol during an experiment. might change remains constant does not exist does change

The identities of substances are the same before and after which type of change

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !