| Micas are silicate minerals that can separate into thin ____. |
crystals |
| Rock fragments, mineral grains, and shell pieces are ____. |
minerals |
| The Earth's two magnetic ____ move gradually over time. |
ores |
| Igneous rocks that cooled slowly have relatively large ____. |
poles |
| Most rocks are aggregates (mixtures) of ____. |
sediments |
| Profitable minerals (copper, gold, iron) are extracted from ____. |
sheets |
| Mineral formations hanging from cave ceilings are called ____. |
stalactites |
| Mineral formations rising from cave floors are called ____. |
stalagmites |
