| A | B |
|---|
| rugged | having a rough, uneven surface |
| musher | the driver of a dogsled team |
| vowed | promised |
| checkpoint | a place along a route where a check or count is made |
| volunteer | someone who helps free of charge |
| blizzard | a long, heavy snowstorm with strong winds |
| whiteout | heavy clouds over snow, leading to completely white conditions that make it impossible to see |
| refuge | a safe or covered place out of bad weather |
| burrowed | dug a hold like a small animal |
| experienced | having the knowledge or skill from having done a particular thing in the past |
