Back to Course The First Great Lesson 0% Complete 0/0 Steps Discussion Pre-lesson Questions Video Lessons The First Great Lesson Experiments and Activities Force of Attraction Settling Layers According to Density Directions to Make Your Own Volcano Beginning of the Universe Nomenclature Cards Beginning of the Universe Research Cards Answers Answer Key: The First Great Lesson The First Great Lesson The First Great Lesson Section 2 of 8 In Progress ← Previous Next→ The First Great Lesson