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HOW COME? From log to petrified wood

How does ordinary wood turn into petrified wood, which feels like rock? asks a reader.

A petrified log may look like an ordinary wooden log, complete with growth rings and bark. But touch it, and you'll realize that the log is like a model of the original, cast in rock. The stone log may also be streaked with vivid colors and glitter in the sun.

Think of a chunk of petrified wood as...

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