Across
- 4. the energy produced by the heat within the Earth
- 5. a nonrenewable resource formed from the buried remains of plants and animals that lived long ago
- 8. any natural material that is used by humans, such as water, petroleum, minerals, forest and animals
- 10. natural resources used to generate energy
- 11. a natural resource that can be replaced at the same rate at which it is consumed
- 12. a natural resource that are used to make objects, food, or drink
- 13. the use of the force of moving air to drive an electric generator
Down
- 1. plant material, manure or any other organic matter that is used as an energy source
- 2. electrical energy produced by the flow of water
- 3. a resource that forms at a rate that is much slower than it is consumed
- 6. the energy received by Earth from the sun in the form of radiation
- 7. the energy released by fisson (splitting) or fusion (combining) reaction, the binding energy of atomic nucleus
- 9. the nuclei of radioactive atoms are split into two or more fragments.