"In the fourth book in the Asha and Baz series, readers learn about volcanoes from renowned volcanologist Katria Kraft! Asha wants to win a super cool volcanic rock by solving the Great Volcano Challenge at school. So she and her best friend Baz use their magic stick to travel to Iceland in 1973 to learn from famous volcano researcher Katia Krafft. She's sure to be able to help them with their project, but she's got an eruption to observe and data...