Warm-up Note: you MUST write in COMPLETE sentences.

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Warm-up Note: you MUST write in COMPLETE sentences. An “Ore” is a mineral that can be Ex-_______ at from the Earth to make a P__________. What type of rock process makes heavy minerals? (Sedimentary, metamorphic, igneous?) What makes Coal Electricity better and worse than solar electricity? tracted rofit

“Alternate Energy Sources” Chapter 4, Section 2

Solar Energy 1 Second… The Earth gets enough energy from sun to power all nations for 10,000 days. Solar energy = Sun’s Rays  heat & electricity

Solar Energy… Good: Bad: “Fuel” is free No Pollution! Equipment & installation = Expensive! Backup supply needed when it’s night/cloudy.

What makes this a good place for a “SOLAR FARM?”

Nuclear Energy Nuclear Fission: Nuclear Fuel = radioactive materials 7 % U.S. Energy. Nuclear Fuel = radioactive materials Large atoms “Heavy Metals” Nuclear Fission: Splitting large atoms Releases Energy Heat Heat  spins steam turbines  Electricity

Nuclear Energy Fuel Pool San Onofre Nuclear Plant, California

Wind Energy Q: What do we use wind for? In the year 2000, wind supplied a little less than one percent of California’s electricity Goal: Wind power = 10 % US Electricity. Good = Free “Fuel” Bad: “Noise pollution” (NOISY!) Needs LOTS of land! = EXPENSIVE!

Where? Why!?

Hydroelectric Power Hydroelectric Power: Death of a Dam. DAMS! Q: How have humans USED moving water? Hydroelectric Power: Power from falling water 5 % U.S. Electricity DAMS! Stored Energy  Moving Water  Spins Turbines  Electricity! Death of a Dam. Fill with sediment.

Glen Canyon Dam and Lake Powell, Arizona and Utah Border Hydroelectric Power Glen Canyon Dam and Lake Powell, Arizona and Utah Border

Geothermal Energy Energy from Earth’s Internal heat “Geo” = Earth “Thermal” = Heat Energy from Earth’s Internal heat Inside heat. Near Volcanoes. Clean. Runs out. “Cools off”

Tidal Power “Tides” = in/out movement of ocean. Dam where ocean meets land. Movement of tide makes turbines spin.

HW: Assignment Read Ch. 4, Sect. 2 (pg. 102-107) Do Section 4.2 Assessment #1-6 (pg. 107)