Tion 4 Hydrogen gas (Hz) can be found in trace amounts in Earth's atmosphere. Which of these
statements describes a physical property of hydrogen?
Choose the correct answer.
1 Hydrogen is found in acids.
2 Hydrogen gas is highly. flammable.
3 Hydrogen reacts with oxygen to form water.
4Hydrogen gas is less dense than oxygen gas.

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.

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