1.  _____________________________________ causes tides.

2. The earth's rotation and the change in wind direction causes cause the circulation of the oceans current   to be _______________ (right) in the Northern Hemisphere and ________________ (left) in the Southern Hemisphere.

3.  The salt content or ______________ of the ocean water comes from _______________ salts from  the rocks and soil of the river beds.

4.The _______________ cause waves on the surface of the ocean (and on lakes).

5.  Waves in the water move only _______________________.

6.  Sonar uses ____________________ to map the depth of the ocean floor.

7.  The tsunami's speed diminishes as it travels into shallower water but its _____________ grows which can destroy everything at the coastline.

8.  The discovery of vents on the ocean floor were discovered by using the submersible _____________

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