| The molten rock expelled by a volcano is called ____. |
batholith |
| The molten rock below the Earth's surface is called ____. |
element |
| Minerals are identified by their hardness and ____ (powder color). |
glass |
| Volcanic ____ is the product of rapidly cooling lava. |
hardness |
| Quartzite is a rock, whereas quartz (silicon dioxide) is a ____. |
lava |
| Mount Rushmore is a granite ____ formation in South Dakota. |
magma |
| Carbon, copper, silver, and sulfur are single ____ minerals. |
mineral |
| The Mohs scale is used to measure the ____ of a mineral. |
streak |
