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10 Strange Things You Probably Didn't Know About Earth

Across
Flip-flops every several hundred thousand years or so.
Mediterranean’s most widespread seagrass.
1.3 million of these migrate between Kenya and Tanzania
The world’s largest cave.
Creates the illusion that the island of Mauritius is in a precarious position.
Largest single organism reported.
Mushrooms connected by a tentacular underground network of tissues called what?
Which mammal is credited with the largest known mammal migration?
A pair of objects twirling around each other is called?
The first U.S. woman to walk in space
Down
Formed by hundreds or thousands of starlings flying in tandem.
One of the reasons hundreds/thousands of starlings fly in tandem
Where the undersea waterfall is found.
The year that the first U.S. woman walked in space.
Named the "Cave of Crystals"
What causes the river in the Peruvian Amazon to be near boiling temperatures?
Only planet known (so far) to support life