1. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 QOD : Little Tommy wants to dig a tunnel all the way to China. Why can’t he? Geothermal energy

2. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 What is geothermal energy? Use a computer to find out… 1.Google “geothermal energy” 2.Find out and write down at least 8 facts OR 1.Go to New York Times 2.Find and summarize an article about geothermal energy

3. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Share: What is geothermal energy?

4. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 #3.24 Aim: How is geothermal energy harnessed?

5. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Geothermal energy comes from the heat in earth’s core Heat rises through natural cracks and warms groundwater. Evidence of hot spots!

6. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 How do geothermal plants produce electricity? 1. Magma heats groundwater 2. …which turns into steam

7. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 How do geothermal plants produce electricity? 3. Steam turns turbine, electricity is produced! 4. Steam is cooled back into water and returned to the groundwater Geothermal energy can also be used for heat!

8. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Geothermal facts: Provides <0.5% of total energy use world-wide In the U.S. we have enough to power 1.4 million homes

9. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Pro’s 1. Renewable (mostly) 2. Few greenhouse gases emitted 1 megawatt of electricity produced at a geothermal plant prevents the emission of 7.8 million pounds of carbon dioxide from gas-fired plants

10. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Con’s 1. Not all geothermal power plants are sustainable At the geyers in Napa Valley, CA the plant uses hot water faster than the groundwater can heat it up again.

11. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Con’s 2. Can only be harnessed in certain areas Think back to earth science… do you think these spots will ALWAYS be good locations for harnessing geothermal energy?

12. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30 Pro’s and con’s of geothermal energy

13. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30

14. #3.24 Aim: How is geothermal energy harnessed? Agenda QOD (5) Activity: What is geothermal energy? (15) Lesson: Geotherma l energy (15) Summary: pass-back quizzes HW #30