Our lives would be very different without oil, gas, and coal. These fossil fuels help heat our homes, turn on our lights, and power our cars and trucks. But they also damage our environment-and they won't last forever. Learn how we use these energy sources today and find out how we might use them with cleaner sources of energy in the future.
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What's an Audio Format Audio format refers to the way an audiobook is recorded. Not all audiobooks have the same formats. Classic Audio: A human reading an audiobook without the text displayed. VOICEtext (H): Human narrator with text that you can follow along with as it reads. VOICEtext (S): Synthetic voice with text you can follow along with as it reads.
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