I.P. Mizzaz 
The Deep Dark Ocean [EPUB ebook] 

After a fateful encounter with a mysterious dragon in their local library, Oliver and Amelia were taken on a magic adventure in space to learn about the sun, the planets, and the formation of the universe!
Now, they’re back and as curious as ever. Are sea monsters real? What about sunken treasure? And what exactly is water pressure? Oliver and Amelia want to find out!
Join Oliver, Amelia, and Mizzaz, the dragon on a magic journey through the depths of the ocean as they learn about sharks, whales, pirates, water pressure, sea monsters, and sunken treasure.