Across
- 3. it is a fuel that is composed primarily of methane
- 5. these are solid fuel used as an alternative to coal from plant and animal wastes like scraped chunks, corn husk, animal and sewage manure
- 7. _____ fuel has a negative net energy yield
- 9. hardest type of coal with high heat content and low sulfur content
- 10. _____ sand is a type of crude oil found in combination of sand and clay
Down
- 1. _____ is a type of fuel from decayed organisms living a long time ago that has a high net energy yield but are the main cause of environmental problems
- 2. In _____ solar heating, the interior of the building is painted with dark-colored paint and this painted interior is exposed directly under the sun
- 4. simultaneous production of multiple forms of energy from a single source that maximizes the energy yield
- 6. nuclear _____ is the process used by the sun wherein two light atoms are forced together at high temperature
- 8. type of fuel rod used in nuclear fission reactions