Permafrost by permafrost. Of this area slightly more than half is underlain by continuous permafrost, around 20 percent by discontinuous permafrost, and a little less than 30 percent by sporadic permafrost. Most of this area is found in Siberia, northern Canada, Alaska and Greenland. Beneath the active layer annual temperature swings of permafrost become smaller with depth. The deepest depth of permafrost occurs where geothermal heat maintains a temperature above freezing. Above that bottom limit there may be permafrost, whose temperature doesn't change annually—"isothermal permafrost". Permafrost typically forms in any climate where the mean annual air temperature is less than the
The Diamond Mine (short story) artist's relationship with her family. The Diamond Mine (short story) "The Diamond Mine" is a short story by Willa Cather. It was first published in "McClure's" in October 1916. Aboard a ship, Cressida Garnet, a soprano, meets a cousin of her late first husband's. She tells him of her love affair with Blasius Bouchalka, a Bohemian violinist who was her second husband. After he had an affair with their maid, Ruzenka, she filed for divorce and never saw him again. She is now set to marry Jerome Brown, a financier. Later, we learn that Cressida died on the RMS Titanic.