Historical clue formulations

• About 90% of all volcanic rock on Earth — 2024-07-23
• Product of volcanic activity — 2023-12-27
• Dark volcanic rock — 2022-10-20
• Volcanic substance — 2021-01-31
• Volcanic rock — 2020-10-02
• Makeup of many moon rocks — 2017-09-21
• Volcanic rock — 2012-01-19
• Some moonrocks — 2007-09-23
• Rosetta stone composition — 2005-10-28
• Volcanic rock — 2004-11-28
• Black rock — 2004-03-10
• Igneous rock — 2000-08-25
• Volcanic rock — 1994-07-27