At level two, the text itself mixes both longer, complex sentences with very simple sentences, such as this: "But sometimes animals act strangely before an earthquake hits. Birds fly in circles. Dogs bark for hours." The book also includes some challenging vocabulary like foreshocks, tsunami, and magnitude. Though the reading does include some challenges, the fascinating subject matter helps encourage kids to stick with it. My six-year-old daughter found it interesting enough to read over and over.