| 2026-09-05 | Underground rock |
| 2026-08-26 | Heat source for many hydrothermal vents |
| 2026-07-24 | Component that may emerge from Earth's asthenosphere |
| 2026-06-04 | Soft rock? |
| 2026-01-09 | It's bubbling below the surface |
| 2025-04-21 | Molten rock |
| 2024-01-25 | Heated pool? |
| 2023-02-16 | Underground rock? |
| 2021-09-20 | What lava is before an eruption |
| 2021-08-23 | Molten rock in a volcano |
| 2021-06-15 | Molten rock |
| 2021-03-20 | Underground rock? |
| 2020-08-02 | Obsidian, once |
| 2020-03-07 | Source of igneous rock |
| 2019-01-23 | Lava below the surface |
| 2018-02-08 | Molten rock |
| 2016-06-29 | Soft rock? |
| 2015-07-12 | Soft rock? |
| 2013-05-20 | Underground molten rock |
| 2012-01-22 | Eruption sight |
| 2011-07-19 | Molten rock |
| 2011-04-11 | Volcanic rock material |
| 2009-10-05 | Molten volcanic material |
| 2009-04-28 | Volcanic buildup |
| 2004-01-28 | Source of igneous rock |
| 2002-09-30 | Molten rock |
| 1995-09-06 | Igneous rock's source |
| 1995-05-19 | Molten matter |
| 1994-06-05 | Source of igneous rock |