Why does some part of the ocean floor look so scratchy?
If you look at Google Earth image of the Indian ocean floor, especially the area south-west of Sumatra, it looks like some cosmic beast scratched it with its sharp claws. The same thing can be seen near the Hawaiian islands. I know it has something to do with tectonic movements and stuff, but I don't know for sure.
The sea floor around Cocos Islands
So what is the explanation for this?!