Elements more massive than iron (e. g. silver, uranium and lead) are created from supernova events (an explosion of a star) a) true
b) false

(a) True

Explanation:

A supernova is a powerful light explosion that occurs in massive stars.

During a supernova, the star releases very large amounts of energy as well as neutrons, which allows elements heavier than iron, such as silver, uranium and lead, to be produced.

Therefore, the correct option is "a" True

Elements more massive than iron (e.g. silver, uranium and lead) are created from supernova events.

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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