What Is Sea Level, Really?

Why is the most fundamental reference point on Earth—sea level—actually an agreed-upon lie? In this video, we dive deep into the fascinating geophysics, oceanography, and satellite geodesy behind why our oceans are not flat. From the permanent 20-centimeter water height difference across the Panama Canal to the Earth's lumpy, potato-shaped gravitational "geoid," discover why sea level varies by over 100 meters across different ocean basins. Learn how melting ice sheets warp local gravity to lower nearby waters, why post-glacial rebound makes Scandinavia rise while Louisiana sinks, and the unsettling truth about modern sea level measurements. #EarthScience #Oceanography #ScienceExplained #Geophysics #Geography #HowItWorks #ClimateScience #Geodesy #Stem #Physics