| 11. | Smaller puffs of ash, vapor and volcanic gases continued to sputter from the volcano Tuesday.
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| 12. | In 1995, five hikers were found dead near Popocatepetl's crater, possibly due to volcanic gases.
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| 13. | But with the volcano still spewing volcanic gas, evacuees don't know when they can go home.
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| 14. | Technology for measuring volcanic gases has also improved.
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| 15. | These tunnels are very hazardous, with pockets of volcanic gas or carbon dioxide, causing rapid death.
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| 16. | The lake is actually the world's largest flooded fumarole, a vent that releases volcanic gases and smoke.
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| 17. | Negligible amounts of volcanic gas were found.
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| 18. | The spectrometer detects infrared light as it passes through, and is absorbed by, a plume of volcanic gas.
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| 19. | Water vapor is consistently the most common volcanic gas, normally comprising more than 60 % of total emissions.
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| 20. | Two reports in a recent issue of Nature, however, demonstrate that remote sensing of volcanic gases is now possible.
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