I think the answers of your questions are :
1- he gave them information about sneffels and arranged for a guide called Hans
2- two peaks or several peaks
3-because the professor promised him to give up the journey if they didn't find water on the next day -
- the professor was eager to continue the journey till the end
4-when they reached the blank wall and no way behind it
5-when he drank the water he became eager to continue the journey
6-he thought they are wrong as the centre of the earth couldn't be hot
7-water or Axel's fears of the journey
best wishes
Mr ayman
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