Igneous rocks are found under and above the earth's surface and are formed by millions of years of solidifying. Learn more about ingenious rocks in this educational geology video.
PracticePractice Igneous Rock Classification questions
Levels are CK-12's student achievement levels.
BasicStudents matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient)Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
AdvancedStudents matched to this level are ready for material that requires superior performance and mastery.