| 41. | It is a hydrothermal mineral occurring in volcanic rocks such as basalt.
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| 42. | It has been observed swimming over fields of hydrothermal vents.
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| 43. | Some earthquake activity may be associated with neighbouring hydrothermal fields.
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| 44. | It occurs in the oxidized zone of arsenic-bearing hydrothermal veins.
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| 45. | Various parts of the main volcano have been subjected to hydrothermal alteration.
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| 46. | The volcanic necks are defined by magmatic-hydrothermal breccias.
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| 47. | Most of these mineral deposits were created from hydrothermal activity.
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| 48. | Over 300 new species have been discovered at hydrothermal vents.
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| 49. | Researchers have speculated that these hydrothermal effects should be common on Mars.
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| 50. | In these areas, hydrothermal solutions forced their way to the surface.
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