Essentials of Geology Study Set 3
Quiz 4 :
Igneous Rocks and Intrusive Activity
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Q41 Q41 Q41
In a series of basaltic lava flows on Hawaii, the top and bottom of each flow is difficult to distinguish just by looking at the layers of rock. What are some rock characteristics (texture, mineralogy, etc.)and other features that you might use to recognize individual lava flows?
Q42 Q42 Q42
The size of crystals in igneous rocks is generally a function of the rate of cooling. However, within the same rock, crystal size does not necessarily reflect the order of crystallization for individual minerals. Without using Bowen's Reaction Series, how might you determine the order of crystallization of minerals in an individual rock sample? (Hint: Think about the texture.)