| Answer | Crossword Clue |
|---|---|
| TECTONICPLATE | Shifting piece of the earth's crust |
| FELDSPAR | Most of the earth's crust |
| SIMA | Layer of the Earth's crust |
| SIAL | Part of the earth's crust |
| PLATE | Part of the earth's crust |
| FELDSPAR | 60% of the earth's outer crust |
| IRON | About 5% of the earth's crust. |
| SIMA | Lower layer of the earth's crust |
| DIRTPORTION | Very, very top of the earth's crust? |
| SILICON | A chief elementary constituent of the earth's crust. |
| SILICON | More than a quarter of the earth's crust |
| SILICATE | Kind of compound comprising most of the earth's crust |
| SILICON | More than a quarter of the earth's crust, by mass |
