| A | B |
|---|
| Scientist who studies structure of earth | Geologist |
| Molten rock erupting through earth | Lava |
| Decaying material | Humus |
| Material helpful to man | Natural resource |
| Solid with definite shape/Flat surface and sharp edge | Crystal |
| Rare, beautiful mineral | Gemstone |
| Stone icicle hanging from roof | Stalactite |
| Stone formation growing from floor | Stalagmite |
| No longer in existence | Extinct |
| Hardened sap of trees | Amber |
| Sand is main component | Sandstone |
| 75% of earth's surface rock | Sedimentary |
| Durable artificial rock | Concrete |
| Made from bones & seashells | Limestone |
| Formed from mud | Shale |
| Once limestone but hardened under pressure | Marble |
| Used for chalkboards | Slate |
| Used in pencils | Graphite |
| Used in plaster | Gypsum |
| Breaks in flat sheets | Mica |
