Bibliografi Sumber buku Anonymous. (2002). Geology and Chance. Asia: Time Life. Diane H. Carlson, C. C. (2008). Earth Revealed. U.S.A: Mc Graw Hill. Keller, E. A. (2001). Environmental Geology. U.S.A: Pearson Prentice Hall. Christopher Maynard. (1989). Planet Bumi. London: Grolier. Sumber internet Alden, A. (2015, 2 28). Rock Identification Table. Retrieved from http://geology.about.com/od/rocks/a/Rock-Tables.htm Anonymous. (2015, 2 2). An Introduction To Igneous Rocks. Retrieved from http://csmres.jmu.edu/geollab/fichter/IgnRx/ Introigrx.html Anonymous. (2015, 2 5). Igneous Rocks. Retrieved from http://geology.com/rocks/igneous-rocks.shtml
Sumber buku Anonymous. (2002). Geology and Chance. Asia: Time
Life.Diane H. Carlson, C. C. (2008). Earth Revealed. U.S.A: Mc Graw
Hill.Keller, E. A. (2001). Environmental Geology. U.S.A: Pearson
Prentice Hall.Christopher Maynard. (1989). Planet Bumi. London:
Grolier.
Sumber internet Alden, A. (2015, 2 28). Rock Identification
Table. Retrieved from
http://geology.about.com/od/rocks/a/Rock-Tables.htmAnonymous.
(2015, 2 2). An Introduction To Igneous Rocks. Retrieved from
http://csmres.jmu.edu/geollab/fichter/IgnRx/Introigrx.htmlAnonymous.
(2015, 2 5). Igneous Rocks. Retrieved from
http://geology.com/rocks/igneous-rocks.shtml
