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The claim which you read is that Ganymede has a 600 km deep outer mantel of salt water with a layer of ice over top of it. There are two reasons why they tell people that, i.e. they are trying to explain:

The ultralow moment of inertia, and:
The conductivity which they believe the require to explain the intrinsic magnetosphere while retaining the belief that such a magnetosphere would have to be created by an ongoing Dynamo effect.
Problems with this line of thinking include (minimally):

The fact that such a Dynamo effect would be ongoing and such an intrinsic magnetosphere created by a Dynamo effect (both on earth and on Ganymede) would be continuously topped off and would not diminish; nonetheless we know that our own magnetosphere is diminishing.
There are dark areas on the surface which you should assume to be solid land, and you cannot have solid land sitting on top of an ice sheet on top of a 600 km deep outer mantel of water, with or without salt.
A much more reasonable assumption is that the intrinsic magnetospheres both on earth and on Ganymede were fused in very early on by intense Birkeland currents and are basically remnants, having nothing to do with any sort of Dynamo effect.

The outer mantel of Ganymede is basically pumice and not water. Pumice is lighter than water and floats and would more readily explain the ultralow moment of inertia. Conductivity within such an outer mantel of pumice would be explained by the kinds of P-holes which creates surface conductivity on rocks. Pumice, of course, is by volume mostly surface, like the radiator in a car.

Putting Jupiter inside one AU of our sun (where you find most gas Giants and dwarf stars orbiting primaries within our galaxy) and Ganymede becomes a freshwater ocean world with light both from the dwarf star and the sun, and both bergs and anchored islands of pumice.

What do we know about Cro Magnon Man?

For starters, the most major thing which we DON’T know about Cro Magnon or Pre-Adamite man, is exactly how many such separate groups of them arrived on Earth via separate events. Troy McLachlan and I use the term Cro Magnon to mean all humans living prior to Adam and Eve as a means of simplifying the discussion, but there could have been more than one such group. There is also a quesiton as to how many times advnced cultures might have risen and then fallen again in the huge space of time since the earliest such Cro Magnon groups.

One thing scholars all agree on is that whatever caused Cro Magnon people to appear on this planet when they did was not gradual. Danny Vendramini ("Them and Us") notes:

“The speed of the Upper Palaeolithic revolution in the Levant was also breathtaking. Anthropologists Ofer Bar-Yosef and Bernard Vandermeersch:
“Between 40,000 and 45,000 years ago the material culture of western Eurasia changed more than it had during the previous million years. This efflorescence of technological and artistic creativity signifies the emergence of the first culture that observers today would recognise as distinctly human, marked as it was by unceasing invention and variety. During that brief period of 5,000 or so years, the stone tool kit, unchanged in its essential form for ages, suddenly began to differentiate wildly from century to century and from region to region. Why it happened and why it happened when it did constitute two of the greatest outstanding problems in paleoanthropology.”

Likewise Dwardu Cardona ("Flare Star"):

"Where and how the Cro-Magnons first arose remains unknown. Their appearance, however, coincided with the most bitter phase of the ice age. There is, however, no doubt that they were more advanced, more sophisticated, than the Neanderthals with whom they shared the land. Living in larger and more organized groups than had earlier humans, Cro Magnon peoples spread out until they populated most of the world. Their tools, made of bone, stone, and even wood, were carved into harpoons, awls, and fish hooks. They were presumably able hunters although, as with the Neanderthals, they would also have foraged to gather edible plants, roots, and wild vegetables. The only problem here is that, as far as can be told, the Cro Magnons seem to have arrived on the scene without leaving a single trace of their evolutionary ancestors. Ian Tattersall observed:

'When the first Cro Magnons arrived in Europe some 40,000 years ago, they evidently brought with them more or less the entire panoply of behaviors that distinguishes modern humans from every other species that has ever existed.'"

There is also a question of artwork, i.e. going from hominids with no artistic capabilities whatsoever to the Cro Magnon Sistine Chapel at Lascaux, with no evidence to be found in the world of any sort of a run-up to that. That obviously is not compatible with the idea of humans evolving from apes and/or hominids.

What that IS compatible with is the idea that Cro Magnon man, fully formed, CAME here from somewhere else in our system, which is the basic thesis of Cosmos in Collision ( www.cosmosincollision.com ) and the short video titled “Ganymede Hypothesis, Human Origins:

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