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.
In The Hobbit, Gandalf is referred to as Gandalf the Grey, which signifies his âlesser wizardâ status compared âthe Whiteâ wizards. In due time, Gandalf is indeed upgraded to Gandalf the White, however this transformation takes place in his journey during The Lord of the Rings.