What is a tsunami? Learn what they are, what causes them, the damage they can cause, and some of the biggest tsunamis in history. Can we protect ourselves from a tsunami?Compass Readers is a 70-book, 7-level collection of readers designed for elementary to intermediate learners of the English language. Learners will enjoy reading this unique array of fiction and nonfiction graded readers. The series has been creatively designed to develop English language learning through structured academic design.This series includes:Fiction and nonfiction readers with downloadable audioLevel and age appropriate topics and themesSubject matter covering nature, social studies, science & technology, history, and biographiesCarefully chosen vocabulary covering essential high-frequency English wordsA glossary and index featuring key terms at the back of each readerA downloadable teacher’s guide