ALBERT HOPPER, SCIENCE HERO

A ground-shaking, pulse-pounding journey to the Earth’s core and back (with a few side trips along the way).

In typically grandiloquent tones—“We shall be…WORMING TO the CENTER OF THE EARTH!”—froggy explorer Albert Hopper invites Junior Science Heroes (and niece and nephew) Polly and Tad on a voyage of danger and discovery aboard aptly named mechanical drill Wiggles. Though Tad’s inability to leave the onboard “Anything Can Happen” button alone results in time travel, an encounter with prehistoric cavefrogs (“We shall explore this…UNEXPLORED CAVERN!”), and other unexpected twists, the trip also features plenty of basic natural science. The travelers go from crustal plates to core (“The inner core is nearly…TEN THOUSAND DEGREES!”), up and down a volcano’s lava tubes, and through an earthquake. Meanwhile Hopper or know-it-all Polly discourse on topics geological, from plate tectonics and the three types of rocks to cratons. Thick-lined cartoon vignettes with green highlights on nearly every page capture the comical turns better than they do the science, but along with tucking in the occasional rudimentary chart or poster, Himmelman backs up the factual content with summary notes from both Junior Science Heroes at the end. For an equally rousing but visually richer dive into the depths, follow up with Jon Chad’s Leo Geo and His Miraculous Journey Through the Center of the Earth (2012).

Will leave readers eager to…GO AGAIN! (Informational fantasy. 7-10)