What is
the sum total of all water on earth and its atmosphere is called

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

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 !

What four properties do all waves have in common