Our planet is broken down into four systems or spheres: the atmosphere, lithosphere, hydrosphere, and biosphere. These systems are all interconnected and help provide balance on Earth and within the planet's ecosystems. Readers of this informative series will learn about cycles associated with each system and each system's impact on the planet as a whole. Additionally, these books discuss how humans interact with each system and how their activities can impact these systems, both positively and negatively. Each Book Contains: • Engaging, curriculum-based text that breaks down and explains each of Earth's spheres • Intriguing fact boxes that delve deeper into specific topics and provide fun tidbits of information • In-depth sidebars that explore related topics to broaden readers' knowledge of this high-interest STEM subjectCurriculum Connections: • "Think About It" sections include questions that enhance critical thinking skills • Engaging content gives readers a well-rounded look at how STEM curriculum topics are at work in the world around them • Reinforces key science curricula on topics such as Earth science, climate change, and environmental studies
