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