Hi.
Chemical Change: A and D
Physical Change: B and C
The lines around the finger of the doorknob represent the electric force on the charged objects.
Answer:
Earth's atmosphere is an extremely thin skin surrounding our planet. What force keeps it from flying off into space? Earth's atmosphere is only 1/1,200,000 the mass of Earth itself. ... The answer is gravity – the same force that keeps us anchored to Earth
