In a model of earth's layers that is determined by physical properties, how might the atmosphere be classified? would it be part of the lithosphere or a seperate layer?

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

As a small change in a person's dna can cause a genetic disorder

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