34. When a cell phone is turned on what energies are formed?
A chemical sound + light
B. electrical chemical + sound
C. mechanical chemical sound
D. chemical electrical light +sound

35. Earth's crust breaks when there is a sudden release of energy during an earthquake. What characteristic of the crust is responsible for this?
A. Brittleness
B. Elasticity
C. Ductility
D. Texture​