TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Diffusion is the term for the movement of molecules from an area of high concentration to an area of low concentration.

SOLUTION: What is the term for the movement of molecules from an area of high concentration to an area of low concentration?

PROBLEM: Constructive forces type of forces are involved when deposited rock forms deltas or barrier islands.

SOLUTION: What type of forces are involved when deposited rock forms deltas or barrier islands?

PROBLEM: The mole fraction of the solvent is just one minus the mole fraction of solute.

SOLUTION:
The mole fraction of the solvent is just one minus the mole fraction of what?