HW#12: Igneous Rocks & Intrusive Activity

Instructions: Answer the questions below using one to five sentences.

13. Define Bowen’s reaction series.

14. How does the crystallization and settling of the earliest formed minerals affect the composition of the remaining magma?

15. How are most basaltic magmas thought to have formed?

16. What is the process that is thought to generate most granitic magmas?

17. Describe dikes and sills, using the appropriate terms from the following list: massive, discordant, tabular, and concordant.

18. In what type of environment are pegmatites produced?