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Heimildaskrá
Dyngja. (11 2018). Sótt frá Wikipedia: https://is.wikipedia.org/wiki/Dyngja
Hilmar Egill Sveinbjörnsson. (2015). Um víða veröld - Jörðin. Reykjavík: Námsgagnastofnun.
How many active volcanoes are there on Earth? (án dags.). Sótt frá USGS: https://www.usgs.gov/faqs/how-many-active-volcanoes-are-there-earth?qt-news_science_products=0#qt-news_science_products
Newcomb, T. (13. 4 2017). 7 of the World's Most Fearsome Active Volcanoes. Sótt frá Popular Mechanics: https://www.popularmechanics.com/adventure/outdoors/g3040/7-fearsome-active-volcanoes/
Twig. (12. 11 2012). Geography Lesson: What is a Volcano? Sótt frá Youtube: https://youtu.be/WgktM2luLok
Volcano. (2. 11 2018). Sótt frá Wikipedia: https://en.wikipedia.org/wiki/Volcano
What are some good things that volcanoes do? (11 2018). Sótt frá Volcano World - Oregon State University: http://volcano.oregonstate.edu/what-are-some-good-things-volcanoes-do
Dyngja. (11 2018). Sótt frá Wikipedia: https://is.wikipedia.org/wiki/Dyngja
Hilmar Egill Sveinbjörnsson. (2015). Um víða veröld - Jörðin. Reykjavík: Námsgagnastofnun.
How many active volcanoes are there on Earth? (án dags.). Sótt frá USGS: https://www.usgs.gov/faqs/how-many-active-volcanoes-are-there-earth?qt-news_science_products=0#qt-news_science_products
Newcomb, T. (13. 4 2017). 7 of the World's Most Fearsome Active Volcanoes. Sótt frá Popular Mechanics: https://www.popularmechanics.com/adventure/outdoors/g3040/7-fearsome-active-volcanoes/
Twig. (12. 11 2012). Geography Lesson: What is a Volcano? Sótt frá Youtube: https://youtu.be/WgktM2luLok
Volcano. (2. 11 2018). Sótt frá Wikipedia: https://en.wikipedia.org/wiki/Volcano
What are some good things that volcanoes do? (11 2018). Sótt frá Volcano World - Oregon State University: http://volcano.oregonstate.edu/what-are-some-good-things-volcanoes-do