The state of reduced clarity of liquid, due to the concentration of suspended sedimentary or other particles
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Category: <span>T</span>
A large tunneling machine capable of drilling large tunnel and room sizes passages in solid rock
An opening and passage into a mine
A hard, brittle, metal. Symbol, W
A part of the arctic and subarctic region unsupportive of larger rooted plants and trees due to permafrost
A light porous, pyroclastic rock