Here are the definitions:
1. Atmosphere - The envelope of air surrounding the Earth. It protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.
2. Hydrosphere - The combined mass of water found on, under, and over the surface of a planet, including lakes, rivers, oceans, groundwater, and atmospheric water vapor.
3. Lithosphere - The solid, rigid outer part of the Earth, including the crust and upper mantle.
4. Biosphere - The global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, hyd