Glossary of Scientific Terms

10 Most Abundant Elements<br>in the Earth's Crust

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10 Most Abundant Elements in the Universe

Source: Exploring Chemical Elements and their Compounds; David L. Heiserman, 1992

ElementAbundance
measured relative to silicon
Hydrogen40,000
Helium3,100
Oxygen22
Neon8.6
Nitrogen6.6
Carbon3.5
Silicon1
Magnesium0.91
Iron0.6
Sulfur0.38