'The everyday type of it is calcite; the type rock climbers use to get a grip is magnesium carbonate'
chalk
GET A GRIP: The everyday type of it is calcite; the type rock climbers use to get a grip is magnesium carbonate
The everyday type of it is calcite; the type rock climbers use to get a grip is magnesium carbonate
The everyday type of it is calcite; the type rock climbers use to get a grip is magnesium carbonate
GET A GRIP
chalk
GET A GRIP