A part of the arctic and subarctic region unsupportive of larger rooted plants and trees due to permafrost
A part of the arctic and subarctic region unsupportive of larger rooted plants and trees due to permafrost
A light porous, pyroclastic rock
A volcanic sedimentary deposits of calcium carbonate
A standard of measurement commonly used for mercantile minerals
A weight equal to 373.2509 grams
A weight equal to 31.1034768 grams