#1-4 true or false questions! 1. intrusive igneous rocks have fine-grained crystals. t or f? 2. igneous rocks are formed by cooling and hardening magma or lava. t or f? 3. metamorphic rocks are formed when sediments harden into rocks. t or f? 4. lithification is the process of converting sediments into solid rock through compaction and cementation. t or f? 6. which type of rock forms when heat and pressure change existing rocks without melting them? a. metamorphic b. igneous c. sedimentary #7-9 true or false questions! 7. once a metamorphic rock, always a metamorphic rock. rocks cannot change from one type of a rock to another. t or f? 8. the rock cycle has a definitive beginning and end. t or f? 9. foliation occurs in sedimentary rocks. t or f?