Four students measured the mass of a piece of metal whose accurate mass is 34.75g. their result are 34.2g,33.75g,35.0g and 34.69g. what is the best estimate for the mass of the piece of metal? and why?

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 !