Which sentence contains a compound subject? a. a tornado can level a small town b. the economy or tge weather can make a small town fall apart c. small towns like oak grove still prosper d. economic downfall is a hazard small towns face

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

the ima (higher than 1m) will be greater than the ima with the height of 1m.