Geothermal pool, New Zealand. Geothermal pools form in areas where volcanic activity causes hot water to rise up from beneath the Earth's surface. The

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Geothermal pool, New Zealand. Geothermal pools form in areas where volcanic activity causes hot water to rise up from beneath the Earth's surface. The hot water is often brightly coloured, due to minerals dissolved in it. Here, algae, growing in the 60-degrees-Celsuis water, produce the green colour. In the background is a sinter terrace (white), formed as silica and calcium minerals are deposited from the hot waters. This terrace, called the Golden Fleece Terrace (Te Kapua), is in Orakei Korako, a geothermal valley between Rotorua and Taupo on New Zealand's North Island.

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