1. Geosphere: The solid part of the Earth, which includes the crust, mantle, and core.

2. Hydrosphere: The water on Earth, which includes the oceans, lakes, rivers, glaciers, and groundwater.

3. Atmosphere: The gases that surround the Earth, which includes oxygen, nitrogen, carbon dioxide, and water vapor.

4. Biosphere: All the living things on Earth, which includes plants, animals, and microorganisms.