Issues In Earth Science are a teaching resource and they’ve put together a really informative supporting work package for the classroom, so if you want a bit of background science click on the Teaching Resources link at the top of the story.
The cold bit into me. I forced myself on, step by painful step through the deepening drifts. Numb toes. Numb fingers. Beside me Mitzi stumbled and dropped to her knees and the sledge we were dragging slid into the back of my legs. I reached out with clumsy fur wrapped hands and tried to pull her to her feet.