White light is a combination of electromagnetic waves with frequencies from:

Energy derived from hot rocks and fluids beneath the earth’s surface is

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point