Backfilling is the right one
is about 55 miles at its narrowest point. so around 50 miles would be the answer.
Hjn gln gig GLNG shim gim. Gm. Hjn.
I believe the answer you're looking for is temperature and precipitation.
Climate is based on the amount of rainfall (i.e. a rainforest) or the temperature (i.e. a tropical climate)
Magma chamber
central vent
crater
I think