21. At Philips Point spring tides rise 25 to 30 feet, and neap tides from 16 to 20 feet. 22. Spawning takes place between June and October, at night at two-weekly intervals coinciding with neap tides. 23. Spring ( and the opposite, neap ) tides result from the relative positions of Earth, Moon and Sun. 24. Generally it is located on rock surfaces rather than under stones, and is often found above neap high water mark. 25. Because the tidal speed doubles, eight times more tidal power can be produced at spring tides than at neap tides. 26. The semimonthly markings created by spring and neap tides are prominent and easier to identify and count than the daily tidal marks. 27. The NEAP mission is expected to cost less than $ 50 million, about $ 15 million for each of three instruments: 28. Smith is one of the scientists who have notified NASA that they intend to propose experiments for Benson's NEAP mission. 29. At neap tides, this interaction is less pronounced, without tides surges would occur more randomly, approximately every 12 hours. 30. This latter approach had caused problems at spring tides, although on neap tides Giant's Grave still had to be used.
