EAPS 10200 Lecture Notes - Lecture 5: Oceanic Crust, Columbia Plateau, Extrusive Rock

• School: Purdue University
• Department: Earth Atmos Planetary Sci
• Course: EAPS 10200
• Professor: Professor Balloti

Document Summary

In many ways the earth is a living organism! Intrusive igneous formations: a batholith is a mass of igneous rock that has migrated upward from a deeper magma chamber. Often a batholith cools and hardens before it reaches the surface: dikes and sills are other forms of intrusive formations that often originate from a. Dikes are vertical intrusions while sills are horizontal intrusions: a laccolith is an igneous intrusion that forms between sedimentary layers. Intrusive igneous formations: the rock formations that batholiths, dikes, sills, and laccoliths intrude into often can be eroded so that the harder intrusions become visible on the surface. Extrusive igneous rock: extrusive igneous rocks form when a magma makes it to the surface still in a molten state, this is called lava. Much lava actually extrudes on to the surface of an oceanic plate which of course is under water. In the modern world volcanoes are the other major extruder of lava.