Expansión y conducción – ¿Sabías que?

The video explains how mirages are formed due to the warming of air near the ground. As the air warms, it expands and rises, causing light rays to twist and distort. This distortion creates the optical illusion known as a mirage, often seen as a glowing effect on the horizon.

In what way does the expansion of warm air contribute to the phenomenon of a mirage?

Can you explain what a mirage is based on the text?