Groups of Igneous Rocks: Intrusive and Extrusive | Rocks | Geography
The igneous rocks are more commonly classified on the basis of the mode of occurrence into two major groups:- 1. Intrusive Igneous Rocks 2. Extrusive Igneous Rocks. Group # 1. Intrusive Igneous Rocks: When the rising magmas during a volcanic activity do not reach the earth's surface rather they are cooled and solidfied below the surface of the earth, the [...]