| Answer | Crossword Clue |
|---|---|
| ASIA | Major chunk of Earth's surface |
| SEAWEED | Major source of oxygen in the earth's atmosphere |
| convulsion | An earthquake or other violent or major movement of the earth's crust |
| convulsions | An earthquake or other violent or major movement of the earth's crust |
| silicates | Any of the many minerals consisting primarily of SiO42? combined with metal ions, forming a major component of the rocks of the earth's crust |
