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  1. Lava tube - Wikipedia

  2. Lava Tubes - U.S. National Park Service

  3. Lava Tubes – Formation, Facts, Safety - Science Notes and Projects

  4. The Complete Guide to Hawaii's Famous Lava Tubes - TripSavvy

  5. Day Hike- Nāhuku (Thurston Lava Tube) - U.S. National Park Service

  6. Lava Caves/Tubes - Caves and Karst (U.S. National Park Service)

  7. Lava tubes at Lava Beds National Monument | U.S. Geological …

  8. USGS: Volcano Hazards Program Glossary - Lava tube

  9. Lava Tubes | Volcano World | Oregon State University

  10. What Is a Lava Tube, and Where Can I Find One? - Mental Floss