Which "spheres" are interacting when water runs off a glacier? a. biosphere and atmosphere b. atmosphere and cryosphere c. hydrosphere and geosphere d. cryosphere and hydrosphere

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

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?