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After a rune is used, it enters a ten-second 'cooldown' period before it can be used again and runic power decays over time when out of combat. With specific talents, the death knight can also turn their runes into death runes, which can be used as any type of rune. The death knight has the option of three presences: blood, frost and unholy.
Mountaintop removal mining (MTR), also known as mountaintop mining (MTM), is a form of surface mining that involves the topographical alteration and/or removal of a summit, hill, or ridge to access buried coal seams. The MTR process involves the removal of coal seams by first fully removing the overburden lying atop them, exposing the seams ...
Deep sea mining is the extraction of minerals from the seabed of the deep sea. The main ores of commercial interest are polymetallic nodules, which are found at depths of 4–6 km (2.5–3.7 mi) primarily on the abyssal plain.