PLEASE HELP!! Which describes how prevailing winds affect precipitation in a region?

Prevailing winds force cool, moist air from oceans to rise.
Prevailing winds blow in the opposite direction as normal winds.
Prevailing winds cause huge air masses, both warm and cool, to move.
Prevailing winds that move over land usually cause the most precipitation.

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

Determine the moment of the force f about an axis extending between a and c. express the result as a cartesian vector. a is at the origin, c is at (4,3,0) and f = (4i + 12j -3k) lb coming out of b (4,3,-2).

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.