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.
Mount Fuji provides a backdrop to a fireworks display at Lake Yamanaka, one of five lakes at the northern base of the volcano. Resort towns around the volcano sponsor summer festivals featuring elaborate displays of hanabi (fireworks).