If you or your students would like to explore the topic further, these additional resources will be useful.
A laboratory module from the Science Education Research Centre (SERC), Carleton College, to introduce the topic of permafrost and engage the students in discussions about thawing of permafrost and its impact on 'Soil and the Carbon Cycle'. Part B: Permafrost, a Frozen Soil starting to Thaw
An animated video, by Lars Grübner, Alfred Wegener Institute, Norway, that explains permafrost and the effects of permafrost thawing on the Earth’s climate and environment.
Video 'Permafrost- what is it?'