Across
- 5. Energy that comes from a source and travels through space at the speed of light.
- 6. The whole mass of air that surrounds the Earth
- 7. Having no living members; no longer in existence.
- 8. The base level for measuring elevation and depth on Earth.
- 9. Move steadily and continuously in a current or stream.
Down
- 1. enhanced ... effect
- 2. economic activity concerned with the processing of raw materials and manufacture of goods in factories.
- 3. A chemical element with the symbol C and atomic number 6.
- 4. The act or force of one thing hitting another
- 7. The production and discharge of something, especially gas or radiation.