The Center of the earth is about 3,960 miles(6,373 Kilometers) under you. Have you ever thought about what's between you and the earth's core? If you thought it was just cold, solid rock, think again! Book jacket.
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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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