[{"hint": "Think about cooling, compression, and transformation.", "answer": "Igneous (cooled magma), Sedimentary (compressed sediment), Metamorphic (changed by heat/pressure).", "question": "Name the three types of rocks and how each is formed."}, {"hint": "What occurs when two plates push together?", "answer": "Plates collide, forming mountains or subduction zones (one plate slides under another).", "question": "What happens at a convergent plate boundary?"}]