Volcanoes are usually located where tectonic plates meet. This is especially true for the Pacific Ring of Fire, an area around the Pacific Ocean where over 75% of the volcanoes on Earth are found.
The 17 plates found along the back of the Stegosaurus arose from the skin rather than being attached to the skeleton. The largest plates were around 60cm (2ft) tall and 60cm (2ft) wide.
