Why do you think the Renaissance started in cities rather than in the
country side?

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

In the water cycle , when does water undergo a chemical change

What is a dendrite and what does it do?