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Essay Galaxy - The Comparative Abundance of The Elements The Comparative Abundance of The Elements

- There are 92 naturally occurring elements, only 17 of them make up 99.5% of the earth's crust (including oceans and atmosphere). - In living things (plants, animals, people) the six most abundant elements are carbon, hydrogen, oxygen, nitrogen, phosphorus and sulfur. - The universe is dominated by the elements hydrogen (83%) and helium (16%) 1. The Crust The outside of the earth is a thin crust which is approximately 20 to 40km thick. The crust is a formation of dips and hollows which are filled with water to form the oceans and seas. On top of the earth's crust is an atmosphere, this is a thin layer of gases, 95% of these gases are within the first 20km of the earth's surface. Of the 17 elements that make up 99.5%, the most abundant of these are ....

Number Of Pages: 2 Number Of Words: 494

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