Frozen Water?

At the last stop you looked up but here you must look down. The white rock beside the trail is quartz, a mineral comprised of oxygen and silica. Quartz is the second most common mineral in Earth’s crust and is so resistant to weathering that when rocks wear down, the residual material usually contains quartz. That is why most sand beaches are made of quartz. Quartz appears in different colours but white is the most common.  The original theory of how quartz formed was made by the early Roman naturalist/philosopher Pliny the Elder; he declared quartz to be frozen water!