oceanography crossword

1. what countries in the early 1700s thought spices would cure
5. vehicle that are controlled remotely
6. the first dynasty to use trade ships in china
7. the study of past civilizations
10. a serious disease in sailors caused by lack of vitamin c
13. 1492 sailed the ocean blue for spain
15. ship used by Charles Darwin to deepen information of evolution.
16. famously China used boat
17. the first emperors to commission imperial trade fleets
18. ships used by ming dynasty over 500ft long
19. machine that allows ships to measure suface to floor distance using sound waves

2. Greek philosopher thought to be first marine biologist
3. method that allowed scientists to collect sediment from under the sea floor
4. famous USA man that observed and used the gulf stream
6. what new ocean clocks used instead of a pendulum
8. invention that John Harrison worked on to be used on ships
9. the study of current civilizations and their past
11. first expedition used specifically for scientific research of the ocean
12. vehicle that can "fly" underwater
14. the name for all the continents combined, discovered with oceanography by Alfred wegener
19. what material Columbus sailed to obtain