Over 98% of the earth's crust is made of rocks and minerals. These contain the elements:
Silicon | 46.6% |
Oxygen | 27.7% |
Aluminum | 8.1% |
Iron | 5.0% |
Calcium | 3.6% |
Sodium | 2.8% |
Potassium | 2.6% |
Magnesium | 2.1% |
Table of abundance of all elements in the earth’s crust: Israel Science and Technology HomePage
Graphic of abundance of elements in the earth’s crust GRAPHIC
US Geological Survey Fact Sheet on Rare Earths
Air contains:
Nitrogen | 78% |
Oxygen | 21% |
Argon | 1% |
Water | |
Other gases such as carbon dioxide, hydrogen and helium | 0.03% |