Which best justifies the accuracy of the claim? Although Article 1 mentions evidence discovered by scientists, more research is needed about the data source to determine if the claim is scientific. Article 1 is a scientific claim because it says that global warming doesn't create hurricanes. Although Article 2 mentions the study of a hurricane record, it is a scientific claim because the author himself reviewed it and is therefore an expert. Article 2 uses a scientific claim because the author says the Earth is in a cooling cycle.

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

conservation of mass

mass before something happens = mass afterwards