Across
- 3. study rocks, minerals, and fossils
- 4. splitting of at least one uranium atom
- 5. brownish-black rock that is the youngest fossil fuel
- 7. silvery-white metal
- 8. one of the cleanest fossil fuels
Down
- 1. merging of two or more uranium atoms
- 2. combustible materials from the remains of plants and animals
- 6. known as petroleum or crude