My 'What the Hecks' on Google Earth

Hi All!

Through the years browsing GE I have spotted several locations with interesting features on imagery which have never been explained (for me).
These locations have already been posted here, some of those got replies, but after a while these got sank in EB subboard.

With this link-recollection post I try to give them one more chance to be explained, so...

What the Hecks are these on GE?

Underwater ring of sand - Algeria

geoglyph? land-art? PPP? - Algeria

geoglyph? land-art? symbol? - Algeria (solved)

dotted surface earthworks grid - Niger (explanation given) 

"Suction cups" - Mali

Neverseen "omega" earthworks - Kazakhstan (info: "dumbbell" mounds(?))

Weird clusters of humps - Algeria

Spiral patterns on African wetlands (not my find) - (explanation given)

Unexplained sign buried under desert sand - solved

Agrarian riddles from Ukraine

dark rectangles and other oddity - Nesbitt Lake

artifact - Atchafalaya Delta - explanation (solving?) given

two deep cuts, etc. in Taklamakan - explanation given

strange holes, Brazil

strange built structures in african lakebed

Black-diamond-ring landscape, Kazakhstan

strange holes, Russia

there is something under the snow, Russia (solved?) (seems, it is not)

many questions in my aerial archaeology collection

And whadda heck is goin on Mars?! - Round structures on Mars (now it is solved: Rootless cones)

Thanks!

g

I'll see if I have any interpretations.