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The largest local deviations in the rocky surface of the Earth are [[Mount Everest]] (8,848 m [29,028 ft] above local [[sea level]]) and the [[Mariana Trench]] (10,911 m [35,798 ft] below local sea level). Hence compared to a perfect [[ellipsoid]], the Earth has a [[tolerance (engineering)|tolerance]] of about one part in about 584, or 0.17%, which is less than the 0.22% tolerance allowed in [[billiard ball]]s. [http://www.wpa-pool.com/index.asp?content=rules_spec] WPA Tournament Table & Equipment Specifications, World Pool-Billiards Association, Because of the bulge, the feature farthest from the center of the Earth is actually [[Chimborazo (volcano)|Mount Chimborazo]] in [[Ecuador]]. Did Edmund Hillary Climb the Wrong Mountain, Professional Surveyor, [http://www.profsurv.com/archive.php?issue=42&article=589]
The largest local deviations in the rocky surface of the Earth are [[Mount Everest]] (8,848 m [29,028 ft] above local [[sea level]]) and the [[Mariana Trench]] (10,911 m [35,798 ft] below local sea level). Hence compared to a perfect [[ellipsoid]], the Earth has a [[tolerance (engineering)|tolerance]] of about one part in about 584, or 0.17%, which is less than the 0.22% tolerance allowed in [[billiard ball]]s. [http://www.wpa-pool.com/index.asp?content=rules_spec] WPA Tournament Table & Equipment Specifications, World Pool-Billiards Association, Because of the bulge, the feature farthest from the center of the Earth is actually [[Chimborazo (volcano)|Mount Chimborazo]] in [[Ecuador]]. Did Edmund Hillary Climb the Wrong Mountain, Professional Surveyor, [http://www.profsurv.com/archive.php?issue=42&article=589]
The [[mass]] of the Earth is approximately 5.98{{e|24}} kg. It is composed mostly of [[iron]] (32.1%), [[oxygen]] (30.1%), [[silicon]] (15.1%), [[magnesium]] (13.9%), [[sulfur]] (2.9%), [[nickel]] (1.8%), [[calcium]] (1.5%), and [[aluminum]] (1.4%); with the remaining 1.2% consisting of trace amounts of other elements. Due to [[mass segregation]], the core region is believed to be primarily composed of iron (88.8%), with smaller amounts of nickel (5.8%), sulfur (4.5%),
The [[mass]] of the Earth is approximately 5.98 kg. It is composed mostly of [[iron]] (32.1%), [[oxygen]] (30.1%), [[silicon]] (15.1%), [[magnesium]] (13.9%), [[sulfur]] (2.9%), [[nickel]] (1.8%), [[calcium]] (1.5%), and [[aluminum]] (1.4%); with the remaining 1.2% consisting of trace amounts of other elements. Due to [[mass segregation]], the core region is believed to be primarily composed of iron (88.8%), with smaller amounts of nickel (5.8%), sulfur (4.5%),
and less than 1% trace elements. Chemical composition of Earth, Venus, and Mercury, Proceedings of the National Academy of Science, [http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=350422]
and less than 1% trace elements. Chemical composition of Earth, Venus, and Mercury, Proceedings of the National Academy of Science, [http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=350422]