Across
3. If you _______ something you are the first person to do it.
4. to find something.
5. an underwater vehicle.
7. to stop trying to do something ( 2 words )
9. something that cannot be understood or explained.
10. a journey with a special purpose.
Down
1. to travel around a new place to learn about it.
2. sent from one place to another.
6. a large piece of floating ice.
8. a long journey by sea.