| A | B |
|---|
| blizzard | a snowstorm with strong winds. |
| checkpoint | a place along a route where people sign in. |
| courageous | brave; fearless. |
| experienced | having the knowledge to do a particular task. |
| musher | the driver of a dogsled team. |
| rugged | having a rough, uneven surface. |
| vowed | promised. |
| volunteer | someone that helps free of charge. |
| whiteout | heavy clouds over a snowstorm making it impossible to see. |
| refuge | a safe or covered place out of bad weather. |
| burrowed | dug a hole like a small animal. |
| layover | a brief stop on a trip. |
| squinted | looked with eyes partly open. |
