Help 7th grade science

Identify the type of heat transfer occurring when chocolate melts in your hand

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.

How can a cyclist's acceleration change even if its velocity remains constant?