After he makes a few
adjustments, he slowly drags huge squeegees fully loaded with white paint across the canvas — first vertically, then horizontally — a
process that grows
slower and increasingly laborious as the layers accumulate.
Thicker ice sheets can be more resistant to melting by having colder surfaces (but also depress the crust more, so that when melting occurs, it may leave ocean instead of land (isostatic
adjustment being a
slow process — from memory, a timescale of ~ 15,000 years?)