Curated OER
Igneous Rocks
In this igneous rock instructional activity, student fill in 25 blanks to complete sentences about types of igneous rock, classification of igneous rock, components of igneous rock and how the types of igneous rock are formed.
National Earth Science Teachers Association
Windows to the Universe: Volcano Formation
Explanation of the factors that result in the formation of volcanoes, some basic but helpful animations and photographs.