- Definition of Intrusive Vulcanicity
- Features of Intrusive Vulcanicity
- Meaning of Volcano
- Classification of Volcanoes
- Hot Springs and Geysers
Definition of Intrusive Vulcanicity
Intrusive vulcanicity involves the solidification of molten magma within the earth’s crust.
Features of Intrusive Vulcanicity
The following are features of intrusive vulcanicity;
This is an intrusion which forms when magma solidifies within vertical faults. Dyke forms walls of hard rocks. Examples are Dykes of Cleveland in England.
Sill is a sheet of solidified magma which lies horizontally as a result of intrusion along the bedding planes of sedimentary rocks. Examples are Northumberland in English, Salisbury Craig in Zimbabwe and the little and Great Karoo in South Africa.
This is a dome-shaped mass of igneous rock formed deep down in the crust. It is often composed of granite and extends for hundreds of kilometers. The formation of usually is attributed to the sinking in and resultant melting and incorporation of large blocks of surrounding area rocks into the molten magma which may later solidify.
- NEW: Download the entire term's content in MS Word document format (1-year plan only)
- The complete lesson note and evaluation questions for this topic
- The complete lessons for the subject and class (First Term, Second Term & Third Term)
- Media-rich, interactive and gamified content
- End-of-lesson objective questions with detailed explanations to force mastery of content
- Simulated termly preparatory examination questions
- Discussion boards on all lessons and subjects
- Guaranteed learning