<http://schema.org/description>
"Mountain biking has grown in popularity since the 1970s. Trails for all levels of skill are available and can be beautiful and exhilarating. Take this quiz to learn more about discovering mountain bike trails."^^<http://www.w3.org/2001/XMLSchema#string>
<http://adventure.howstuffworks.com/outdoor-activities/biking/mountain-bike-trails-quiz3.htm>