My favorite part of Chapter two was reading about hot spots and how they can create volcanoes.  They have volcanic centers resulting from hot materials produced deep in the mantle.  Keller (2008, p. 54), explained that "if the hot spot is anchored in the slow-moving deep mantle, then, as the plate moves over the hot spot, a chain of volcanoes is produced". 

In Chapter 3 I liked reading about Metamorphic rocks mostly because the name attracted my attention.  Then I read more about how they are changed by heat, pressure, and chemically active fluids produced by the tectonic cycle.  They can be changed into new rocks.  It was also surprising to read that igneous and metamorphic rock make up 90% of all rocks in the Earth's crust.