Instelling (USGS): wat een vulkaan is (vent, krater, schoorsteen), magma en lava, gassen en explosiviteit, composiet- of stratovulkanen, vulkanen rond de Middellandse Zee en Ring of Fire, Vesuvius, Volcanoes and People.
Titel
Volcanoes (USGS General Interest Publication)
Auteur(s)
Robert I. Tilling
Organisatie
U.S. Geological Survey
Jaar
1997
Taal
en
Pagina’s / fragmenten
'The Nature of Volcanoes'; 'Composite volcanoes'; 'Volcano Environments'; 'Volcanoes and People'
4 november 2026, Claude (bronnenscout bewegende-aarde, Sonnet): Tekst opgehaald en gelezen (4 nov 2026; laatste wijziging 1997). 'Molten rock below the surface of the Earth that rises in volcanic vents is known as magma, but after it erupts from a volcano it is called lava'; 'The essential feature of a composite volcano is a conduit system through which magma from a reservoir deep in the Earth's crust rises to the surface'; 'Most composite volcanoes have a crater at the summit which contains a central vent'; 'Mount Etna in Sicily is the largest and highest of these mountains'. OUDE CIJFERS: 'more than 500 active volcanoes' (1997) niet overnemen. De tekst noemt 24 augustus 79 als datum van de Vesuvius en een aardbeving in 63: niet overnemen (zie Zuchtriegel e.a. 2024 in sources.json).
