(24) Michael Oswald.
http://commons.wikimedia.org/wiki/File:Thurston_Lava_Tube.jpg. Public
Domain.
(25) http://en.wikipedia.org/wiki/Pyroclastic_flow. GNU-FDL.
(26) http://en.wikipedia.org/wiki/Volcano. GNU-FDL.
(27) http://en.wikipedia.org/wiki/File:Pacific_Ring_of_Fire.svg. Public
Domain.
(28) http://en.wikipedia.org/wiki/Lava_dome. GNU-FDL.
(29) http://en.wikipedia.org/wiki/File:Devils_Tower_CROP.jpg. GNU-FDL.
(30) http://en.wikipedia.org/wiki/Image:Filtering_ofhoney.jpg. GNU-FDL.
(31) http://en.wikipedia.org/wiki/Lava. GNU-FDL.
(32) http://commons.wikimedia.org/wiki/File:Earth-crust-cutaway-english.svg.
CC-BY-SA 3.0.