There was a supercontinent called Pangea
Answer:
b.
Explanation: I do not know much about this but the answer that i think it is was b.
C, electrons are negative, and most of the atom’s mass comes from the nucleus of the atom
Answer:
Coefficient of friction.
Explanation:
The amount of friction divided by the weight of an object is equal to the coefficient of friction. It is a dimensional less number. It can be given by :
N is normal force.
= coefficient of friction