What happens if the south pole of one magnet is put next to the south pole of another magnet? A. The poles attract each other. B. There is no impact
C. The poles repel each other.

d. air pressure decreases as altitude increases.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

technology is the application of the knowledge gained by science.