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Name: Class: Date: Professor: Vocabulary Challenge Why was six afraid of seven? Because seven, eight, nine! Match the term to its defintion. 1. a fixed point on the shore from which tide heights may 2. a wavelike advance of the tide in a narrow bay or river 3. the period of time when the disk of the Moon is fully illuminated 4. the point of rotation for Kelvin waves, that is, tides 5. a long-wavelength gravity wave that propagates eastward along the equator or counterclockwise in Northern Hemisphere basins 6. the portion of sea level variability attributable to changes in seawater density 7. the time of one complete tidal cycle; about 24 hours and 50 minutes 8. the average height of the ocean relative to a shoreline when the effects of tides, waves, and other ocean disturbances have been removed 9. the center point of no tidal displacement around which amphidromic tides rotate ExploreWorldOcean.com Total Grade -210. the angle between the position of the Moon (or Sun) and the equatorial plane; analogous to latitude, declination takes values of 90 degrees at the North Pole and -90 degrees at the South Pole 11. the vertical height of the tide above the zero tide height, the tidal datum, or a tide gauge benchmark 12. the average of the lowest tide that occurs in regions with mixed semidiurnal tides 13. the individual contributions of the gravitational forces of planetary bodies to the tides 14. the response of Earth’s crust to the daily differential gravitational forces of the Sun and the Moon 15. a fixed marker on a hard substrate on which measurements of tide height can be based 16. the discrepancy between measurements of sea level based on tide gauge stations versus satellites 17. the 16.8-year time period over which measurements of zero tide levels are based 18. the period during the tidal cycle when the tidal range is maximal 19. when viewed from Earth, the period when no Moon is visible at nighttime 20. the horizontal (tangential) gravitational forces of the Moon and Sun that cause the tides ExploreWorldOcean.com Total Grade -321. the ideal shape of the Earth from which measurements of sea level may be based 22. the highest sea level during a tidal cycle 23. the time of delay between the passage of the Moon overhead and the high tide 24. the subsidence or uplift of Earth’s crust that results from advancing or retreating glaciers, respectively 25. flows of water associated with tides 26. the period of the tidal cycle when tidal currents are maximal 27. the idea put forth by Newton that the tides could be explained as tidal bulges resulting from the gravitational forces of the Sun and the Moon 28. a type of daily tidal pattern characterized by one high tide and one low tide 29. the minimum sea level in a tidal cycle 30. changes in sea level due to increases or decreases in the amount of seawater 31. the tilt of Earth relative to its plane of orbit around the Sun 32. as viewed from Earth, the period of the lunar cycle when the disk of the Moon appears half full ExploreWorldOcean.com Total Grade -433. the volume of water in an estuary contributed by the ocean, typically estimated as the difference between sea level at the mean high and mean low tides 34. the semidiurnal tidal component caused by the Moon’s gravitational field 35. the length of time for the Moon to orbit Earth and return to the same position relative to distant stars; about 27.3 days 36. the period at the height of the high or low tide when the speed of tidal currents is minimal 37. the daily periodic rise and fall of the sea surface due to horizontal movements of water 38. the theoretical accumulations of water that result from the gravitational forces of the Moon and the Sun, as developed by Sir Isaac Newton 39. the period of time in the monthly tidal cycle when the range of tides is minimal 40. the time between successive high or low tides; about 12 hours and 25 minutes 41. the long-wavelength Kelvin wave produced as a result of dynamic forcing of the tides; in essence, the tides 42. in amphiodromic tides, the line that connects equivalent times 43. the semidiurnal component of tides caused by the gravitational attraction of the Sun ExploreWorldOcean.com Total Grade -544. a quantitative description of tidal motions in terms of their wavelike motions 45. in amphidromic tides, the line that connects equivalent tide heights 46. tidal range 47. periods of Earth’s geologic history between the ice ages 48. a daily tidal pattern characterized by two high tides and two low tides of approximate equal height 49. a tidal pattern consisting of two high tides and two low tides of unequal height 50. the period of time when tidal currents are slack, usually at the peak of the high and low tides ExploreWorldOcean.com Total Grade