It's more like highway built on fundamentally unstable coastal geology[1] falls into the ocean here and there. [1] California is basically schmutz scraped off

It's more like highway built on fundamentally unstable coastal geology[1] falls into the ocean here and there. [1] California is basically schmutz scraped off a subducting plate over the last 100 million years. Friend worked on a job where they excavated into a hillside behind a house and found a 10 inch wide crack filled with wet clay.