How does a bone turn into stone?

1. 1

   Tiny says

   Long ago, a dinosaur's bones lay by a river. Mud and sand washed over them and buried them. Then water trickled into the bones and left tiny bits of rock behind, again and again. Very slowly, over thousands and even millions of years, the bones turned to stone.

   For ages 4–7
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   Checked against How are dinosaur fossils formed? (Natural History Museum)

2. 2

   Why are fossils so hard to find?

   Most bones rot away before mud can cover them, so only a few ever become fossils. Those few end up buried under deep layers of rock. Then, over millions of years, wind and rain wear the rock away, until one day a fossil peeks out.

   For ages 6–9
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   Checked against How are dinosaur fossils formed? (Natural History Museum)

In Lil' Phil, reaching the bottom of this wonder earns a sticker for Tiny's collection.

• 

  Who digs up dinosaur bones?

  Ages 4–11Tiny
• 

  When did dinosaurs live?

  Ages 4–11Tiny