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states of matter

920

Ice in bird bath
We are expecting a hard freeze tonight. The water in our bird baths will probably have a layer of ice, if they don't freeze solid. If cold water sinks, why does the ice form at the top?

928

Snow on trees
We have already had our first snow of the year. The day it snowed, the low was only 36°F. If the temperature is above freezing, why did the precipitation not fall as rain?

941

Cat in snow
Although we have had several days with lots of sun and temperatures up in the 60's, there is still a lot of snow on the ground. Why hasn't it melted away?

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