Across
- 4. where whales come to breathe
- 5. large marine animals
- 10. unable to be seen
- 11. ocean spanning 20 million square kilometres
- 12. a small part studied
Down
- 1. facts, statistics items of information
- 2. the total number of inhabitants in one place
- 3. another word for strategy or manner
- 6. to chase or search for, for the purpose of killing
- 7. to make an approximate judgment, to guess
- 8. an argument outlining positive and negative points
- 9. a specialist in biology