Abundance of Materials
Earth's Crust
- https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth%27s_crust
- Thus, iron, aluminum, hydrogen, sodium, carbon, oxygen, calcium, nitrogen, silicon, are all game.
- Example, Zn is 24th most abundant at 79 ppm. 1 g contains 79 micrograms, 1 kg contains 79 mg, and 1 ton contains 79 grams. 1 ppm means one ton contains 1 gram of it.
- 1 gram of hydrogen, for fusion, releases 75 MWhr of energy. According to E=mc2 Calculator
