Have you ever wondered what El Ni–o was? This nonfiction book, Ocean Currents and El Ni–o, discusses El Ni–o, other ocean currents, and how ocean currents affect the climate and people around the world. Includes a glossary for the bold-faced vocabulary words, reading activities, an index of terms, and an answer key. Reading Level: 6, Fountas and Pinnell: Level T, Interest Level: 4Ð8. The Readers Advance(TM)Science, Mark Twain Media series is a perfect Common Core resource to support the development of nonfiction reading skills. The selected science topics correspond to the most popular science topics currently being taught at each grade level. The high-interest, informational text is leveled to the respected Fountas and Pinnell Guided Reading leveling system to ensure a young reader's success.