An intrusion is an igneous rock body that forms from crystallized magma under Earth's surface.any mountain ranges, such as the Sierra Nevada in California, are formed mostly by intrusive rock, large granite (or related rock) formations. Intrusions are one of the two ways igneous rock can form; the other is extrusive, that is, a volcanic eruption or similar event.
Admit it: you were pronouncing the word âSmaugâ â the name of the Hobbit dragon, the one whoâs in the subtitle of the upcoming movie installation â as âsmog.â.
EXCLUSIVE: Luke Evans has bagged the role of Bard in The Hobbit, a last major part that Peter Jackson hadnât cast in a production thatâs underway in New Zealand. Bard the Grim is a skilled archer, and the heir of King Girion of Dale. The king was killed by the talking dragon Smaug. The character plays a greater role in the second film, and is somewhat reminiscent of the action-hero exploits of Viggo Mortensen âs Aragorn, Iâm told.