| Charlotte Amelines, MSN Environment Contributor |  |
Earth’s seven biggest mysteries
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Planet Earth – it’s the only place we have and ever will live. But when asked fundamental questions about its nature, we’re often stumped.
How did such a rich and fertile world form from a lifeless cloud of dust and gas? What happened in between its creation and the appearance of life? How indeed, did life begin, how much is there and why has it ended abruptly in mass extinctions more than once?
The truth is that these and many more key questions still baffle our most brilliant scientists, and our ever-changing world yields its secrets with extraordinary reluctance. But piece-by-piece, we are putting together the puzzle that is the planet Earth.
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