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Primary Structures in Igneous Rocks [Pdf]
This 23-page slideshow explains what intrusive and extrusive igneous rocks are and the characteristics of their structures. Each type of structure is accompanied by one or more images. (Website for Mining Engineering students at Mehran...
Center for Educational Technologies
Center for Educational Technologies: Exploring the Environment: Volcanoes
Learn about volcanoes and apply what you know to making decisions about how to handle real world situations. You will find lots of supporting materials for these activities.
US Geological Survey
Usgs: Types of Volcanic Eruptions
Types of volcanic eruptions are named after actual volcanoes. View the eruptions of these volcanoes.
Other
Geology.com: Rocks: Photos of Common Intrusive and Extrusive Igneous Rock Types
Explains the difference between intrusive and extrusive igneous rocks and provides pictures and descriptions of common igneous rock types in each category.
CK-12 Foundation
Ck 12: Earth Science: Types of Volcanoes
[Free Registration/Login may be required to access all resource tools.] Different types of eruptions create different types of volcanoes.
CK-12 Foundation
Ck 12: Earth Science: Intrusive and Extrusive Igneous Rocks
[Free Registration/Login may be required to access all resource tools.] Describes the features of intrusive and extrusive igneous rocks that cool slowly and rapidly, respectively.