При каких условиях возникают ледники? Почему в одних районах ледники образуются, а в других - нет?

Is he eating honey?
Does he eat honey?
Are they doing their homework at the moment?
Do they do their homework after classes?
Is she looking for her shoes?
Is she staying with her friends?
Does she stay with her friends?
Has she got friends in Berlin?
Did she have a good time?