Mysterious Underwater Structures Around the World part 1

Well...I really don't know what these are, but I know what they look like...computer circuit boards! On lake beds, rivers, and even on the Ocean floor. I've found over a thousand of them all over the planet in the ten years I've been exploring Google Earth. They come in various states of condition, from clear like many of these...to dried up, overgrown with trees and vegetation...to frozen solid and even at high elevations over 12,000 feet. They are submerged under lakes mostly. They are very Ancient in my opinion, because of the overgrowth and the fact that most are found in the most remote regions of the World, many in places hundreds or even thousands of miles from any nearby population. So you be the judge...are they sunken cities. Or are they Computer Circuit Boards!?