This is a 7th grade informational text about the Earth's plate tectonic system, describing what plate tectonics are and how they work underneath the Earth's surface. While reading, students should cite several pieces of textual evidence to support analysis of what the text says explicitly as well as inferences are drawn from the text. Students should also determine two or more central ideas in the text and analyze their development over the course of the text; provide an objective summary of the text (License: https://creativecommons.org/licenses/by-nc/4.0/).