the abbreviation for pounds is 'lb' not 'lbs'. adding a kg value would help make the article accessible worldwide. it has links to dates e.g. 1966 , common english terms e.g 'nurse, american , and repeated geographical items e.g. 'seattle, washington' . low value links dilute the effect of high value links. you may wish to reconsider these.
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calcium is a chemical element with the symbol ca and atomic number 20. as an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. its physical and chemical properties are most similar to its heavier homologues strontium and barium.
2019 xiangshui chemical plant explosion: 21 march 2019 a major explosion at a chemical plant in xiangshui, jiangsu, china, kills at least 64 people and injures more than 600 others. its powerful impact registered as an artificial earthquake.
techniques of surface mining include: open-pit mining, which is the recovery of materials from an open pit in the ground, quarrying, identical to open-pit mining except that it refers to sand, stone and clay; strip mining, which consists of stripping surface layers off to reveal ore/seams underneath; and mountaintop removal, commonly associated with coal mining, which involves taking the top of a mountain off to reach ore deposits at depth. most but not all placer deposits, because of .
tungsten is considered to be a conflict mineral due to the unethical mining practices observed in the democratic republic of the congo. there is a large deposit of tungsten ore on the edge of dartmoor in the united kingdom, which was exploited during world war i and world war ii as the hemerdon mine.