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Did you know the deepest parts of the ocean are still largely unexplored? Courageous explorers risk their lives to go to these great ocean depths. Other explorers journey into deep volcanoes, caves, and mines. Who are they and why are they seeking a glimpse of the world deep below the earth's surface? Turn the pages to find out!
"This series introduces young readers to 25 explorers whose expeditions pushed the limits of technology and human endurance. . . . A supplemental purchase for large collections." - School Library Journal
November 1, 2020