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Trip around the world in 63 days, 2003
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Then we have to hurry for the eruption of the geyser Lady Knox. All over the world there are only 450 geysers. They need water, the mineral rhyolite and geothermic heath. It works as follows. Rhyolite forms cracks which are partly sealed by this rhyolite, so a “plumbing” of cracks and channels forms in the ground. If water is filling the cracks, it is heated up. Depending on the depth it may reach temperatures far over 100 degrees C. If somewhere the water starts boiling the volume increases and water starts streaming out of the opening. The result is that the volume of water is less, so the pressure down there becomes less. The super heated water start boiling then, pushing in a kind of explosion the water out of the geyser. The plumbing is now empty, will be filled up again with water, heated and the show can repeat itself.
For reasons not known the reaction can be triggered by letting soap sink in the water. So a person dropped a kilo soap in the geyser and minutes later the show starts.