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Q: What facilitates the movement of materials over the surface?
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Force opposing the movement of one surface over another?

friction


What is the movement of air due to uneven heating called?

The answer is convection currents: the upward movement of warm air and the downward movement of cool air.


Why does air flow from water to land during the day?

The sun more quickly heats the surface of the land during the daytime than that of the water. The reason for this is that the surface of the water has a much higher effective heat capacity (amount of temperature change for a given unit of heat imparted) than land. This contrast in surface temperatures causes the air column over land to expand, consequently an upper level pressure gradient to develop (high over land at altitude vs low over the water) and flow at altitude from land to ocean. This movement of air out of the land air column and towards the water air column causes a surface pressure gradient to develop, with a surface level high pressure over water and a surface level low over the land. This gradient drives the daytime "see breeze" flow of surface level air from the water to the land. It's actually part of a cell that develops that can be thought of as a roll laying parallel to the shore, going up over land, out to sea at height, down over the sea, and towards land at the surface.


Diffusion of materials over long distance is fast true or false?

False, its slower.


What refers to to water that flows over earths surface?

If you are talking about land above sea , then it would be called run off, because when precipitation falls , whether it is rain or snow , at some point it usually makes its way from the land to the sea via flowing over the surface of the earth.