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.
The word Dragonfly and the family it belongs to, Odonata, have evolved from the many myths associated with Dragonflies and their taxonomic cousins, the Damselflies. The word Dragonfly has its source in the myth that Dragonflies were once Dragons.The family name Odonata comes from the Greek word for tooth as Odonates were believed to have teeth, it is a verified fact now that while they don t have teeth per say, they have strong mandibles that they use to crush their prey.he word Dragonfly has its source in the myth that Dragonflies were once Dragons. The family name Odonata comes from the Greek word for tooth as Odonates were believed to have teeth, it is a verified fact now that while they don t have teeth per say, they have strong mandibles that they use to crush their prey.