DAVID LEAH / SCIENCE PHOTO LIBRARY DAVID LEAH / SCIENCE PHOTO LIBRARY
Experimental greenhouse using hydroponic methods to grow garden produce such as tomatoes (right). The site at Cerro Prieto, Mexico, uses geothermal water from a neighbouring geothermal station to grow the produce hydroponically. The mineral rich waters are piped into the greenhouse & the plants are grown directly in the water. In this photograph a gravel layer covers the roots to prevent rapid evaporation.
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