[ETL]

Basalt (left) vs granite

“While early Earth’s undersea surface was made entirely of dark, heavy volcanic rock called basalt, over time, a lighter kind of rock formed. This rock, called granite, was buoyant. It floated up from the ocean floor and gathered in thick layers, creating landmasses that we call continents.”

https://ny.pbslearningmedia.org/resource/nvmn-sci-granitebasalt/wgbh-nova-making-north-america-granite-vs-basalt-formation/

[grey_whiskers]

This rock, called granite, was buoyant. It floated up from the ocean floor and gathered in thick layers, creating landmasses that we call continents.”

It Floats!