* The Earth's surface: This includes land, water, and ice. Different surfaces absorb different amounts of radiation. For example, dark surfaces absorb more than light surfaces.

* The atmosphere: Gases in the atmosphere, such as water vapor, carbon dioxide, and methane, absorb certain wavelengths of solar radiation. This process is known as the greenhouse effect and is essential for maintaining a habitable temperature on Earth.

* Clouds: Clouds reflect and absorb solar radiation. The amount of absorption depends on the type and thickness of the cloud.

In short, solar radiation that isn't reflected is either absorbed by the Earth's surface, the atmosphere, or clouds.