| What is the distance from crest to crest? (See Arrow)
A. crest
B. trough
C. wave height
D. wavelength
14. 
What is the distance from trough to crest called? (See arrow in picture)
A. crest
B. trough
C. wave height
D. wavelength
15. How many oceans are there?
A. Five
B. Six
C. Four
D. Seven
E. Three
16. What are two types of currents?
A. surface currents and deep currents
B. open and closed currents
C. fast and slow currents
D. spring and neap currents
E. high and low currents
17. What pulls on the oceans to cause the tides?
A. The gravity of the sun
B. The gravity of the moon
C. The wind
D. Density
18. What are the two types of extreme TIDES?
A. Surface and Deep
B. High and Neap
C. Spring and Neap
D. Spring and Winter
19. As you go deeper into the ocean, the temperature goes up.
T. True
F. False
20. As you go deeper into the ocean, salinity increases.
T. True
F. False
21. 
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