* Visible radiation is the portion of the electromagnetic spectrum that our eyes can see, making up the colors of the rainbow. This radiation from the Sun is a major source of heat for the Earth.

* Shortwave radiation is a broader category encompassing visible light, along with ultraviolet (UV) and some near-infrared radiation. This energy from the Sun directly heats the Earth's surface, atmosphere, and oceans.

Here's how it works:

1. Incoming solar radiation: The Sun emits a vast amount of shortwave radiation, which travels through space.

2. Absorption and reflection: When this radiation reaches Earth, some is absorbed by the land, water, and atmosphere, while some is reflected back into space.

3. Heating: The absorbed radiation increases the energy of the molecules within the Earth's system, leading to a rise in temperature.

This is a simplified explanation, but it highlights the key role of visible and shortwave radiation in heating the Earth.