16.Thermokarst failures occur when permafrost—a layer of frozen soil in Earth's polar regions—thaws and becomes unstable, possibly releasing greenhouse gases into the atmosphere.
17.The effect of the result of teston mineral component was analyzed qualitatively by the test of frost heave, thawing settlement and creep consolidate.
18.Newspaper Aftonbladet said on its website that Marita Larsson was walking around Stockholm's Old Town in early March and took a photo of a swan on the river as a spring thaw melted the ice.