The photo above was taken at Foz dos Ouriços Beach, Almograve, SW Portugal. The northern sea cliff shows folded beds of greywacke (light-coloured rock) and shale (dark-coloured)

In the image above, what is the similarity between the water in the foreground and the rocks in the background? Despite the great difference between the two materials, liquid (ocean) and solid (rock), there is a very important similarity that you should discover by yourself. Think critically, without any prejudice, just using simple analysis.

In the video below, produced by Christopher Scotese,

(https://www.youtube.com/shorts/dINrKjuX6DA)

you can see how the lithospheric plates have moved in the last 160 million years (from the present to the past, age in millions of years at the top left corner). In terms of the mechanical behaviour of materials, what does this motion mean? Think critically, without any prejudice, just using simple analysis and relation to the image above.