What did we do?

We located rock faces made of three different types of rock: granite (igneous), gneiss (metamorphic) and sandstone (sedimentary). For each rock type, we judged its breakability by pounding it with a hammer and rated it between 1 and 5, with 5 meaning difficult to break. Then we rated three other characteristics: crystal size, hand pain (does it hurt your hands to climb the rock?) and foot friction (can you get a good foothold while climbing?). more...