Axel was worried about their water because........................ c
The journey would be dangerous but Axel ...................... c
Axel began to get worried when ...................... c
Sneffels has several craters which lead to ...................... c


Why was Hans chosen to go with the professor? c

they have used half their water and so far they didn't find any underground springs
couldn't prevent his uncle from doing it
he saw whole trees preserved in the walls
the bottom of the earth " but only one leads to the center"
he knew the way to Sneffels well