Single Ply, Two-Ply and Three-Ply. Ply is how many yarns are twisted together to make a single thread. Fabrics can either be two-ply or single ply. Two-ply means that two yarns are twisted together to make a single thread that is then woven into the fabric. (Note that this is not at all like two-ply toilet paper!).
Stratovolcano. Mt Fuji is the highest mountain in Japan. The mountain has a base diameter of 50 km. Fuji Volcano consists of three volcanoes: Komitake, Ko-Fuji (Older Fuji Volcano) and the present Fuji (Younger Fuji Volcano). A summit crater is 500 m across and 250 m deep.
Mt Fuji is privately owned above the eighth station. Fujisan Hongu Sengentaisha, a Shizuoka-based Shinto shrine, was granted the land in 1609. The Philippine Tectonic Plate, the Eurasian Plate (or the Amurian Plate), and the North American (or Okhotsk Plate) meet at Mount Fuji.