Geobronnen: https://www.geobronnen.com/

Vulcano World: https://volcano.oregonstate.edu/

Mountain Maker, Earth Shaker: https://www.pbslearningmedia.org/resource/ess05.sci.ess.earthsys.shake/mountain-maker-earth-shaker/

Vulkanen in Mexico: http://volcano.und.nodak.edu:80/vwdocs/volc_tour/mex/mex.html

Volcano Hazards: https://www.usgs.gov/programs/VHP