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.
Thorin Oakenshield, a character in JRR Tolkienâs âThe Hobbitâ, was the grandson of the King of the dwarves, Thror. ThrÃ³r he was known for being leader of the (company Including Bilbo) baggins that took back The Lonely mountain andâit s treasures from the Dragon. smaug