NATURAL SOURCES OF LIGHT
1. SUN
2. MOON
3. STAR
4. JELLYFISH
5. LIGHTNING
6. FIREFLY
7. BUSHFIRES
8. GLOWWORM
9. ANGLERFISH
ARTIFICIAL SOURCES OF LIGHT
1. ELECTRIC BULB
2. MATCHES
3. TORCH
4. FLUORESCENT TUBE
5. CANDLE
6. OIL LAMP
7. LIGHTER
8. NEON LIGHT
9. FIREWORKS
10. GLOWSTICK
