rocks

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9

Across

3. In other states what is oil called?

4. Our most useful metal.

5. This rock was once limestone.

7. A rock that can be chipped to form sharp edges and it will also make a spark when struck by iron.

8. A mixture of copper and zinc. Is what rock?

9. When this rock gets wet it smells like mud.

Down

1. A mixture of copper and tin. Is what rock?

2. The hardest of all substances

5. The mud that buries a plant or animal quickly hardens around it.

6. The rarest gemstone.

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