10 Biggest Unsolved Mysteries About Planet Earth

[Duke]

10 Biggest Unsolved Mysteries About Planet Earth

It's the only world we know, yet there's so much we don't know. From the contents of the core to the dinosaurs' demise, these are Earth's biggest mysteries.

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[Lynne]

A fun read.

 

[7Critter]

A fun read.

I agree. I would not expect this from Readers Digest.

 

[Lynne]

I agree. I would not expect this from Readers Digest.

I agree. I have never thought about where the water and air of our planet came from.