Throughout our history, scientists have been trying to understand ... 428. TOPIC 10. TOPIC. 9. TOPIC. 8. TOPIC. 7. TOPIC. 6. TOPIC. 5. TOPIC. 4. TOPIC. 3 . Travel deep into Earth's crust for the answers in Topics 47. Skill Focus 10. . 5-B. To review safety symbols, turn to. Skill Focus 1. S K I L L C H E C K. Initiating and .
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