2.- Choose all the natural sources of light

3.- Choose all the artificial sources of light:

4.- What is the name of this bulb?

5.- What is the name of this bulb?

6.- What do you prefer?

7.- Is the Sun one of the biggest stars in the space?

8.- Is the thin metal wire that you can find in regular light bulbs...

9.- Are the regular light bulbs eco-friendly?

10.- The fluorescent light bulbs are more eco-friendly than regular light bulbs because they use less electricity...