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.
Smaug appears as the titular primary antagonist in the second film, The Hobbit: The Desolation of Smaug. The first film portrayed him as a four-legged dragon with wings on his back; the design in the second film depicted Smaug with wings on his arms like a bat.