Answer:
Tides are the "vertical movement" of the surface of a body of water.
Step-by-step explanation:
"Tides" is defined as the "rise and fall of the sea water" due to gravitational pull by sun and moon. "Tides" are classified majorly in to two types such as "spring tides and neap tides". Spring tide is "very high tide" which occurs when sun, moon and earth are in the "straight line". "Neap tide" is low tide which occurs when sun, moon and earth are in the "right angle".