| Answer | Crossword Clue |
|---|---|
| ALUMINUM | Most abundant metal in earth's crust |
| OXYGEN | Most abundant element in the earth's crust |
| SODIUM | Sixth most abundant element in the Earth's crust |
| SILICIC | Pertaining to the second most common element in the Earth's crust |
| ARGON | Earth's most abundant noble gas |
| FELDSPAR | Most of the earth's crust |
| SILICATE | Kind of compound comprising most of the earth's crust |
