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www.reference.com/article/composition-mars-1ce53d8025409d5c

Mars is a terrestrial planet, which means it is made up largely of rock. Elements that make up the rock include silicon and different types of metal.

www.reference.com/science/mars-composition-mars-atmosphere-2ed93ee33a0d42f9

The composition of Mars' atmosphere is 95.32 percent carbon dioxide, 2.7 percent nitrogen, 1.6 percent oxygen and 0.08 percent carbon monoxide. The remaining 0.3 percent is made up of various trace elements.

www.reference.com/article/body-composition-be383030db1739bb

Body composition is the ratio of fat to muscle tissue in the body, and it is often used to determine a person's level of health. Three main eneralized body types exist, according to the Center for Wellness Without Borders at the University of Houston. All three are dete...

www.reference.com/article/composite-number-fd9b9020028cc378

A composite number is a positive whole number that can be divided evenly by a number other than itself and one. For example, 12 is a composite number, as it can be divided evenly by three and four.

www.reference.com/article/life-mars-c9d76ceee6db8d0d

As of 2015 there is no conclusive evidence that life on Mars exists or has ever existed, but scientists are hesitant to give a definitive answer without conclusive data. Most experts agree that it is theoretically possible that Mars could have life, but without evidence...

www.reference.com/article/composition-sun-d13dc91687dc9370

The sun is mainly made up of 75 percent hydrogen and 25 percent helium by mass; the sun's is also composed of less than 0.1 percent various metals and elements, including neon, iron, oxygen and carbon. These atoms form hot plasma that is interwoven with the sun´s magnet...

www.reference.com/science/composition-air-42998c6c3c844b66

Air is a gaseous substance that is composed primarily of nitrogen, oxygen and argon. The air in the atmosphere that surrounds the Earth is approximately 78 percent nitrogen, 21 percent oxygen and 1 percent argon, with the remainder made up of various other gases includi...