- Although volcanic eruptions can be almong the most violent and spectacular events in nature and therefore worthy of detailoed study.
- Plutons: Structures that result from the emplacement od igneous materail at depth.
- Plutons are known to occur in a great variety of sizes and shapes. Tabular or Massive: Ways Ingeous bodies are classified.
- discordant: to disagree.
- Concordant: to agree.
- Dikes:Tabular discordant bodies that are produced when magma is injected.
- Dikes are often found in groups that once served as vertically oriented pathway followed by molten rock.
- Silles: Tabular plutons formed when magma is injected along sedimentary bedding surfaces.
- Horizontal stills are the most commen although all orientations enven vertical are kown to exist.
- Columnar Joints: They're formed when rock cools and develop shrinkage fractures that produce elongated.
- Laccoliths: similar to sills becase they form when magma is intruded between sedimentary layers in a near- surface environment.
- Batholiths: Is the largest intrusive igneuus bodies.(depth stone)
- Most batholiths occur as liner structures several hunderds of kilometers long and up to 100 kilometer wide.
- Stocks: mant stocks appear to be portions of batholiths that are not yet fully exposed.
- Xenoliths: Unmelted remnants of the host rocks.