Long ago,people blieved that ghosts moved these stones at night!
But the answer is in fact quite simple and natural.
During the day,Death Valley is one of the hottest places in the world.
However,it is surprising that Death Valley can be very cold at night.
Scientists say that something there are bad storms during the night.
The rain makes the hard ground changes to very thin ice because of the low temperature.
Then the strong wind can move the flat stones along the ground.
In the morning,the sun comes and dries the ground.
People are often surprised that the wind can move such huge stones.
But scientists say that nothing is too diffcult for nature!
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