5.2E| Exercise: Identifying Igneous Rock Texture and Composition

Directions

This exercise will provide you with some practice identifying the textures and composition of igneous rocks. The background information needed comes from the assigned reading and lecture video. You have three attempts and no time limit. 

Time Needed

5-15 minutes.

Learning Objectives

• Students can explain the rock cycle, differentiate among the three types of rocks, and use texture and composition to identify common rocks and their origins
• Describe the processes that form common igneous rocks
• Use texture to classify igneous rocks and to interpret their cooling history and origin
• Describe how the ratio between Fe/Mg and silica dictates the color and composition of igneous rock
• Describe how and where magma forms and evolves 
• Identify intrusive igneous features