He put iron with sulfur and oxygen and it had a few more errors and iron is a metal the other two are nonmetals
Shatter into tiny pieces
The crystal may break due to the fall.
Answer:
a . knowledge and existing theories .
b. falsifiable scope
It is for safety if you come to a sudden stop like newtons law say if an object is in motion it stays in motion until a force stops it if the bike suddenly stopped then you would fly off because you wold still be going. and the gear helps protect you.
