
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...

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...