useless trivia: What Word Means: Struck?

Questions

an _________ is a person bound for a number of years to a master who undertakes to instruct him?

the gaseous material surrounding the earth and other planets is called the ______?

a gigantic mass of snow and ice, mixed with stones and earth, which falls from the mountains into the valleys is called a ______?

who is the roman counterpart of zeus?

who is the greek counterpart of mercury?