Non-renewable resources

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Across
  1. 2. A tunnel underground that that gives access to a mine
  2. 3. something that not be obtained naturally in a human life time.
  3. 5. Acting on its own accordance, usually a machine.
  4. 6. A cheap rock that, when burned, releases energy.
Down
  1. 1. something that can be obtained naturally in a human life time.
  2. 2. the process of obtaining rock, ore, and minerals.
  3. 4. To remove or take out, usually of ores.