Fossil Fuels, Fuels from ancient plants and animals, Renewable Resources, Natural materials replaced shortly after use, The Law of Conservation of Energy, Energy changes form, not created destroyed, Why is thermal energy in a mobile phone wasted, Does not help phone main functions, Why must we conserve fossil fuels, Nonrenewable, used faster than replaced, Why do battery-powered clocks have batteries, Provide chemical energy to move hands, Why is the Sun source for biofuels and fossils, Sunlight stored as chemical energy, What happens if toy car batteries run out, Car stops until recharged or replaced, What happens if fossil fuel burning increases, More smog, acid rain, global warming.

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