orrect answers are hidden. for this attempt: 1 out of 1 tted Jan 28 at 1:52am ttempt took less than 1 minute. Question 1 0.25/0.25 pts Match the igneous rock composition with rock color. Felsic White to light gray 2 Intermediate Medium gray v Mafic Dark gray to black v Question 2 0.25/0.25 pts Which one of the following statements about magma composition is true? Felsic lava has a high silica content, resulting in high viscocity Question 3 0.25/0.25 pts What structure is on the top of Kilauea that you will use to measure the slope of the volcano? Observatory Question 4 0.25/0.25 pts Review Sections A (Igneous Rock Composition) and B (Igneous Rock Texture) and study Figure 4-2 on Bowen's Reaction Series. Basalt (shown in the image below) is a relatively easy rock to identify because of its distinctive dull black color (it weathers reddish brown). Answer the following questions below related to your reading. A. Looking at the above sample, are all the minerals visible to your naked eye? no B. What is the texture of this basalt sample based on your above observation? [ Select ] v C. Review Bowen's Reaction Series in Figure 4-2. What minerals would you expect to find in basalt? [ Select] D. Which of the minerals that compose basalt represent the large crystals you can see with your naked eye? [ Select ] v E. How did the vesicles (void spaces) form in the basalt? dissolved gas expanded as the magma rose towards the surface forming bubbles Answer 1: Answer 2: porphyritic (two-stages of cooling) Answer 3: olivine, pyroxene, Ca-rich plagioclase, amphibole Answer 4: olivine Answer 5: dissolved gas expanded as the magma rose towards the surface forming bubbles Quiz Score: 1 out of 1
