Which of these is true about legos? xd ( don`t use google) a. they are for adults (xd)
b. they are made out of plastic
c. they are awesome (xd)

i guess it’s a and b

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

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