Welcome, curious scientists! Earth is not just a rock floating in space — it’s a dynamic, living planet with vast systems that support life. In this webquest, you'll explore two of Earth’s most important systems: the hydrosphere (all water on Earth — oceans, rivers, lakes, clouds, groundwater) and the atmosphere (the layers of air surrounding Earth). You’ll investigate how water and air move, change, and interact — how water cycles through oceans, clouds, rain, and ground, how the atmosphere i