The atmosphere is the fourth system, and it is an envelope of gas that keeps the planet warm and provides oxygen for breathing and carbon dioxide for photosynthesis. Oxygen is used for respiratory processes in animals to produce energy, for burning fuel to produce heat and light, as a coolant in high processing computers, and for providing a safe environment for newborns in pediatric incubators. Why is the earth mostly made of silicon (rocks) and iron and other elements are much less ? It had to do with the tracheal system, a network of tubes that brings oxygen to … Oxygen is the most common element on Earth, and silicon is the second most common. The remaining 0.03% is composed of traces of gases like neon, krypton, helium and hydrogen. The atmosphere also protects us from incoming meteoroids, most of which break up before they can hit the surface. Atmospheric oxygen levels are fundamentally linked to the evolution of life on Earth, as well as changes in geochemical cycles related to climate variations. Obviously most of the Earth’s oxygen goes into the solid parts of the Earth or its water. Earth's atmosphere is mostly composed of a. oxygen, carbon dioxide, and water vapor b. nitrogen, oxygen, and argon c. oxygen, carbon dioxide, and nitrogen d. oxygen, nitrogen, and water vapor. Their composition is as follows: nitrogen (78%), oxygen (21%), argon (0.93%), and carbon dioxide (0.04%). The most abundant are oxygen (46%), silicon (27.7%), aluminum (8.1%), iron (5%), and calcium (3.6%). The central core of the Earth is made of mostly iron and nickel. a. nitrogen Earth's atmosphere is made mostly of nitrogen and has plenty of oxygen for us to breathe. Water covers 70 percent of Earth's surface. A. In the third system are the areas of Earth that are covered with enormous amounts of water, called the hydrosphere. Planet Earth is made up of a number of elements. Why is Earth's current atmosphere made up mostly of nitrogen and oxygen? -Earth is mostly iron, oxygen and silicon If you could separate the Earth out into piles of material, you’d get 32.1 % iron, 30.1% oxygen, 15.1% silicon, and 13.9% magnesium. Oxygen is only about 20 percent of the atmosphere; the rest is dinitrogen, argon, xenon and other noble gases, and a tiny percent of carbon dioxide, which is again mostly oxygen. Researchers suspect the increased oxygen was responsible for those giant insects. Earth is eroding. There are four main gases in the atmosphere of the earth with oxygen being the second most abundant gas after nitrogen. Water vapor is also present. The outer crust of the earth consists of a number of elements. Which of the following gases cycle into and out of the atmosphere? Composition of the Earth. Of course, most of this iron is actually down at the core of the Earth. b. Oxygen is the most essential gas for the existence of biological life forms on Earth, even though it comprises only 21% of the air in our atmosphere. 1 See answer Answer 4.4 /5 7. janethtopete16 +11 hendikeps2 and 11 others learned from this answer The correct answer is D 4.4 5 votes 5 votes At that time, the Earth’s atmosphere was 35% oxygen, a lot more than the 20% we breathe today. Question Date: 2001-11-19: Answer 1: The solar system is composed of the inner rocky planets (Mercury, Venus, Earth and Mars), beyond which are the gas giants, which probably have solid cores but are essentially big blobs of fluid (gas at very cold temperatures is a fluid). C. Earth is continuing to cool. Earth is special because it is an ocean planet. Earth is warming up. D. Earth has living things on the surface. 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