Question

how often do spring and neap tides occur?
○ twice a day
○ twice a month
○ every 27.3 days
○ every 24 hours

Explanation:

Spring tides form during full/new moons, neap tides during quarter moons. Since these lunar phases occur twice monthly, both tide types happen twice a month. The 27.3-day value is the lunar sidereal period, not tide frequency; twice a day/24 hours refers to regular high/low tides, not spring/neap.

Answer:

twice a month