Correct option - They have a crystalline structure.
Answer:
It would most likely show that at some point Australia in that area had lots of dense forestry in that region as the abundance of forestry would be needed to be turned into coal.
Explanation: During the carboniferous the planet was covered in a large abundance of forestry that would often go into that ground and be compressed by other plant life and occasional flooding of seas and would eventually be turned into coal over millions of years.
Answer:
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Explanation:
