Across
- 4. a strong, hard magnetic silvery-gray metal, the chemical element of atomic number 26, much used as a material for construction and manufacturing, especially in the form of steel.
- 6. combustion or burning, in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke.
- 8. a solid inorganic substance of natural occurrence.
- 11. light from the sun.
- 14. a living organism that feeds on organic matter, typically having specialized sense organs and nervous system
- 15. a living organism of the kind exemplified by trees, shrubs, herbs, grasses, ferns, and mosses,
- 16. The unconsolidated mineral or organic material on the immediate surface of the Earth that serves as a natural medium for the growth of land plants
- 18. Natural gas, is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium
- 20. moisture condensed from the atmosphere that falls visibly in separate drops
- 21. the part of the earth's surface that is not covered by water, as opposed to the sea or the air
Down
- 1. a precious or semiprecious stone, especially one cut, polished, and used in a piece of jewelry.
- 2. classified as a nonrenewable energy source because it takes millions of years to form
- 3. The unconsolidated mineral or organic material on the immediate surface of the Earth that serves as a natural medium for the growth of land plants
- 5. a viscous liquid derived from petroleum, especially for use as a fuel or lubricant.
- 7. a solid material that is typically hard, shiny, malleable, fusible, and ductile
- 9. a loose granular substance, typically pale yellowish brown, resulting from the erosion of siliceous and other rocks and forming a major constituent of beaches, riverbeds, the seabed, and deserts.
- 10. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
- 12. the perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction.
- 13. a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain
- 17. a loud rumbling or crashing noise heard after a lightning flash due to the expansion of rapidly heated air
- 19. the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen