Across
- 3. It's very warm up here with loads of light and life.
- 4. Things get darker here.
- 7. The way organisms produce light in the dark.
- 9. This is where high and low tides occur.
Down
- 1. This is the deepest zone with very little known life.
- 2. The process of converting light to energy by plants.
- 5. They are like mountains.
- 6. There's no plant life and is the start of trenches.
- 8. The vampire squid lives down here.