 Complete the following phrase:  The Zona Volcànica de la Garrotxa Natural Park Catalan:  is a natural park area covering a Holocene volcanic field also known as the Olot volcanic field in Catalonia, northeastern Spain. The volcanos, of which there are about forty within the park, are no longer active, with the last eruption Croscat occurring about 11,000 years ago. However, the region is still seismically active, and a 