Consider a solution made from a nonvolatile solute and a volatile solvent. Which statement is true? a) The vapor pressure of the solution is always greater than the vapor pressure of the pure solvent.
b) The boiling point of the solution is always greater than the boiling point of the pure solvent.
c) The freezing point of the solution is always greater than the freezing point of the pure solvent.

b) The boiling point of the solution is always greater than the boiling point of the pure solvent.

Explanation:

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In this case, when we add a nonvolatile solute to a volatile solvent which has a relatively low boiling point, we can evidence the increase of the boiling point of the resulting solution as more energy must be supplied to take the molecules from liquid to gas. This fact matches with the boiling point elevation colligative property due to the solute's addition, which states that the boiling point of the solution is always greater than the boiling point of the pure solvent, therefore, answer is b).

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geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

the answer would be a