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Explainer: What is a rock?
The definition is caught between a rock and a hard place.
Credit: Jodie Griggs / Getty Images.
Everyone is familiar with rocks. It’s hard not to be. They’re everywhere – we walk on them, skip them across ponds, dig them out of our gardens, and stare appreciatively at them as they form mountains and canyons.
So, we all know what a rock actually
is, right?
Turns out rocks are pretty hard to define
The definition of a rock is a bit woolly, often contradictory, and hard to pin down – even for geologists.
In the broadest sense, a rock is a collection of other things. Officially, it is a collection of one or more types of minerals, held together in a solid mass. ....

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