<http://schema.org/description>
"Climbing grades are systems of letters or numbers (or in some cases letters and numbers) that let climbers know what to expect from the routes they are going to take. Without these ratings systems, it would be difficult to know from place to place what a climb is going to be like. Take this quiz to learn more about calculating climbing grades."^^<http://www.w3.org/2001/XMLSchema#string>
<http://adventure.howstuffworks.com/outdoor-activities/climbing/calculating-climbing-grade-quiz11.htm>