The sun sets for good on December 1st in Cambridge Bay, Nunavut due to its high latitude.The ground is frozen to a depth of 30 cm on that day. The average moisture content the first meter of soil is 30% by mass AND volume, with the rest made of various solid materials. The mixture has a combined thermal conductivity of 1 Wm-1K-1. If the average temperature for December is -20 oC, how deep will the frost line be on January 1st? The density of ice is 916 kgm-3. Ignore any ground temperature drop below 0 oC in your calculations.