Andrew is observing the changes of state when an ice cube is slowly heated from -10c to 110c.
a. the molecules escape the liquid state and become a gas.
b. the ice cube becomes water vapor.
c. the molecules in the water stay fixed and the ice is solid.
d. the ice changes to a liquid and the molecules in the water move faster.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.