The height of the ocean surface averaged over a few years is known as what?

• A. Mean Sea Level
• B. High Tide
• C. Ebb Current
• D. Lunar Tide

Answer: (A)

The main idea here is the long-term average height of the sea surface. Mean sea level is the time-averaged level of the ocean surface, calculated over many years to smooth out daily tides, waves, and weather events. That’s why it’s the best answer for a height averaged over a few years. The other terms describe specific, short-term or predictive aspects: a high tide is a daily peak in water height, an ebb current is the outgoing flow during tides, and a lunar tide refers to tides caused by the Moon’s gravity. Mean sea level serves as a baseline used for maps and measuring coastal changes, though it can vary regionally due to local factors and global trends like climate change.