7. Light energy is also known as _________energry
a. Electrical
b. Light
c. Sound
d. Thermal
8. When you sing a high note, you make your vocal cords move rapidly. What do you call this movement?
a. Combustion
b. Conversion
c. Transformation
d. Vibration
9. At home, we use natural gas as our source of heat energy. What process releases energy?
10. Which of the following can transmit sound fastest?
a. Air
b. Atmosphere
c. Water
d. Wood

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