| http://www.w3.org/ns/prov#value | - Attendees will learn about air quality, recycling, water conservation and other environmental topics.SHARECommentsIF YOU GOWHAT: Earth Day ExpoWHEN: 9 a.m.-4 p.m., SundayWHERE: Texas Zoo, 110 Memorial DriveCOST: $1 for non-zoo members, free for members
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