1. What is the difference between an intrusive and an extrusive igneous rock? (Beginning)
2. Why do extrusive igneous rocks usually have smaller crystals than intrusive igneous rocks? (Intermediate)
3. How are igneous rocks classified? (Beginning)
4. Describe two ways granite is different from basalt. (Intermediate)
5. List three common uses of igneous rocks. (Beginning)
6. Occasionally, igneous rocks will contain both large crystals and tiny mineral crystals. Propose a way that
both these size crystals might have formed in the rock. (Challenging)
7. Why is the ocean floor more likely to have extrusive rocks than intrusive rocks? (Challenging)