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Folkewall: Quiz


Question 1: Greywater: The water feeding the plants in the wall must be free of heavy metals and/or unsafe ________, notably human waste.
Air pollutionMarine pollutionPollutionWater pollution

Question 2: The hollows are filled with inert material like gravel, LECA-pebbles ("light expanded clay aggregate"), perlite or ________.

Question 3: At the bottom of the wall a container collects the purified water, which can then be used for non-________ household use, for watering the garden, or it can be returned to the top of the wall.
Water purificationAzerbaijanDrinking waterMorocco


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