The chemical or mechanical processes by which rocks when exposed to the weather undergo changes in character and break down are called? gravity sedimentation weathering magma

Can someone me with 3 and 4 plz. this is for masteries test.

As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave

How is an endothermic reaction identified