2. In 2009, what percentage of electricity in the U.S. came from burning coal? 1% 10% 30% 45%
3. What does "photosynthesis" mean? Taking pictures Man - made Putting together with light Scrapbooking
4. What happens during photosynthesis? The plant's leaves break and fall off Plants combine oxygen and moonlight to create carbon dioxide Plants use sunlight and combine it with carbon dioxide and water to create oxygen and sugar None of the above
5. What are some problems with today's solar panels? They are hard and brittle and can't repair themselves when broken They can be very expensive On cloudy days, they don't work as well All of the above
Score = Correct answers: