In addition, the role, scope of practice, and prescribing authorization of a nurse midwife will vary depending on licensure and where they practice. Certified Nurse Midwife responsibilities may include: 1  Primary and specialty care for women.
Messages: 357. Slack tide is when the current goes slack between tide changes and slack usually last 30min to an hour after peak high tide or peak low tide(hence high slack or low slack). Feb 27, 2008.
High tides are 12 hours and 25 minutes apart and are separated by a low tide. So low tide must come 6 hours and 12.5 minutes after one high tide and before the next. Position of the Sun and Moon. The height of the tides varies over the course of a month. The highest highs and lowest lows, called spring tides, occur when the moon and the sun are aligned. Moderate highs and lows, called neap tides, happen when the sun and the moon are at 90Â° to one another. 1  Explain how spring and neap tides are created.