| 1 | The mystery lies in the origin of their magma, or molten rock within the Earth. | |
| 2 | At temperatures high enough to melt it, titanium exposed to air catches fire. | |
| 3 | When Earth was forming, molten iron sank to its center, creating the planet's core. | |
| 4 | Lava tubes serve as underground pipelines, allowing molten rock to flow under and away from volcanoes. | |
| 5 | Direct wafer makes individual wafers straight from molten silicon - no cutting required. |