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The hardest thing to explore in the world is earth's core. We only penetrated 8 miles and there are four thousands of miles to the earth's core. Therefore, we don't what exactly inside the earth.
Some scientists suggest that the earth is hollow. It is and hundred-years-old theory. You can decide whether it is true or not after watching this video.
The hardest thing to explore in the world is earth's core. We only penetrated 8 miles and there are four thousands of miles to the earth's core. Therefore, we don't what exactly inside the earth.
Some scientists suggest that the earth is hollow. It is and hundred-years-old theory. You can decide whether it is true or not after watching this video.
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