The document describes the four main subsystems that make up Earth's system: geosphere, hydrosphere, atmosphere, and biosphere. It provides examples of the components that make up each subsystem. The geosphere includes rocks, minerals and land. The hydrosphere contains water in solid, liquid and gas forms. The atmosphere is the gaseous layer surrounding Earth held by gravity. The biosphere includes all living organisms on Earth. It then lists some examples of components for the geosphere, hydrosphere, and atmosphere and describes the main layers of the atmosphere. Finally, it names the four major biomes that make up the biosphere: aquatic, forest, desert, and tundra.