Question

question 12 of 20 : select the best answer for the question. 12. the rock in the picture is rhyolite, an extrusive igneous rock. based on its appearance, how would you classify this rock? a. ultramafic b. felsic c. intermediate d. mafic mark for review (will be highlighted on the review page)

Explanation:

Rhyolite is an extrusive igneous rock. Felsic rocks (like rhyolite) are light - colored, have high silica content, and are rich in minerals like feldspar and quartz. Ultramafic rocks are very dark - colored and rich in iron and magnesium. Intermediate rocks have a composition between felsic and mafic. Mafic rocks are dark - colored and rich in iron and magnesium. Rhyolite's appearance (light - colored, as seen in the image) and its composition match the characteristics of felsic rocks.

Answer:

B. Felsic