La Palma in the 2021 Cumbre Vieja volcanic eruption Towns destroyed by tephra Tephra is lava in the form of volcanic ash, lapilli, volcanic bombs or volcanic blocks. Pompeii, Italy in the eruption of Mount Vesuvius in 79 AD Herculaneum, Italy in the eruption of Mount Vesuvius in 79 AD Cerén, El Salvador in the eruption of Ilopango between 410 and 535 AD Sumbawa Island, Indonesia in the eruption of Mount Tambora in 1815 Plymouth, Montserrat, in 1995. Plymouth was the capital and only port of entry for Montserrat and had to be completely abandoned, along with over half of the island. It is still the de jure capital. See also References External links USGS definition of Aā USGS definition of Pāhoehoe USGS definition of Ropy Pāhoehoe Volcanic landforms of Hawaii USGS hazards associated with lava flows Hawaiian Volcano Observatory Volcano Watch newsletter article on Nyiragongo eruptions, 31 January 2002 National Geographic lava video Retrieved 23 August 2007 Glassforming liquids and melts Igneous rocks Volcanism Eruption products Volcanic degassing