| MAIN
ELEMENTS IN EARTH'S CRUST (in order of decreasing magnitude) |
MAIN
ELEMENTS IN LIVING ORGANISMS (in order of decreasing magnitude) |
| O2 | O2 |
| Si | C |
| Al | H |
| Fe | N |
| Mg | Ca |
| Ca | P |
| Na | K |
| K (minor) | Na |
| Ti (minor) | Cl |
| Mn (minor) | Mg |
See the periodic table on
page 349 in your book
if you are unfamiliar with the chemical symbols.