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How long is 3 centimeters?

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It's about 0.000000008 times as long as The Mississippi River.
In other words, 3 centimeters is 0.0000000079660 times the length of The Mississippi River, and the length of The Mississippi River is 125,500,000 times that amount.
(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 376,600,000 centimeters. Prior to the development of soil erosion programs, the Mississippi River would carry approximately 400 million metric tons of sediment from its banks to the Gulf of Mexico every year.
It's about 0.000000007 times as long as The Distance from L.A. to New York.
In other words, 3 centimeters is 0.000000006680 times the length of The Distance from L.A. to New York, and the length of The Distance from L.A. to New York is 150,000,000 times that amount.
(Los Angeles, California to New York City, New York) (via I-10 E, I-15 N, I-70 E, I-76 E, I-80 E, I-280 E)
The total length of the freeway route from Los Angeles, California to New York City, New York via Interstate 80 is 449,000,000 centimeters long. This route intersects eleven states and several major cities, including Las Vegas, Nevada; Denver, Colorado; Lincoln, Nebraska; Omaha, Nebraska; Des Moines, Iowa; South Bend, Indiana; and Cleveland, Ohio.
It's about 0.000000007 times as long as I-80.
In other words, 3 centimeters is 0.000000006468260 times the length of I-80, and the length of I-80 is 154,601,000 times that amount.
(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 463,803,000 centimeters. A 6,000,000 centimeters stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about 0.000000005 times as long as The Great Wall of China (wall only).
In other words, 3 centimeters is 0.0000000047930 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 208,600,000 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 625,900 centimeters. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about 0.000000005 times as long as The Amazon River.
In other words, 3 centimeters is 0.0000000046610 times the length of The Amazon River, and the length of The Amazon River is 214,500,000 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 643,700,000 centimeters. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about 0.000000004 times as long as The Great Wall of China (total).
In other words, 3 centimeters is 0.000000003390 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 295,000,000 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 885,000,000 centimeters. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about 0.000000003 times as long as The Diameter of Earth.
In other words, 3 centimeters is 0.00000000235178410 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 425,209,100 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 1,275,627,300 centimeters at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1946 by the United States Army, which reached an altitude of 10,460,736 centimeters.