A student uses red litmus paper to test the pH value of different solutions. Which would result in a color change of the litmus paper? Check all that apply.

A: soap
B: biodiesel
C: drain cleaner
D: antifreeze
E: vinegar

The least penetrating form of radiation is

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

Arrange the images in order to show how lake-effect snow occurs.