Examlex
What is the difference between covalent bonds and ionic bonds?
Radioactive Material
Substances that emit radiation as a result of the spontaneous disintegration of atomic nuclei.
Strip Mines
Large, open-pit mines where layers of soil and rock are removed to access underlying minerals.
Underground Machines
No definitive context, but likely refers to equipment used for underground operations such as mining or tunnel construction.
Oil Shale
A fine-grained sedimentary rock containing organic materials that can be processed to produce shale oil, a type of unconventional oil.
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