The moon is an even better example. Not an oval crater on there.

You may be correct that these are plasma discharges.
There is an awful lot of evidence that indicate the grand canyon was a plasma discharge... and then a great deal of water ran though it, first one way, and then another.

If it is space rocks falling, then there probably is some higher order structure, where the plane of the earth is perpendicular to falling things. You know, like gravity is always straight down. We may be talking about very convoluted higher dimensions.