ENERGY. SOURCES OF LIGHT.

ENERGY. SOURCES OF LIGHT.

Quiz (by Juan Luis Serrano Pedrosa).

Fireworks.
1. Natural light source.
2. Artificial light source.
Flashes of lightning.
1. Natural light source.
2. Artificial light source.
Light bulb.
1. Natural light source.
2. Artificial light source.
The Sun.
1. Natural light source.
2. Artificial light source.
Fireflies.
1. Natural light source.
2. Artificial light source.