The two types of energy sources are ____ energy and non-renewable energy. ____ energy sources won't run out because they are always being renewed. ____ energy sources will run out because it takes a long time to make them. The sun, wind, and water are examples of ____ energy sources. Coal, gas, and oil are examples of ____ energy sources. ____ transform solar energy into heat or electricity. ____ transform wind energy into electricity. ____ power stations transform falling water into electricity. We can burn ____ to produce heat and ____. ____ is extracted by drilling into the ground. We use it primarily for ____. ____ is extracted by digging wells in the ground. We use it to produce fuel and ____.

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