Re: Why is 70% of Earth's sial missing?

"Andrew Nowicki" <andrew@xxxxxxxxxx> wrote in message news:46118128.93AF3292@xxxxxxxxxxxxx
Greg Neill wrote:

Sial is the top layer and would be expected to be the source
of much of the material ejected by the mars-sized impactor
that created the Moon. The 70% of the Earth's surface
covered by ocean is largely areas produced by spreading
zones where magma is welling up.

So what's the problem?

1. When a ball-shaped moon collides with a ball-shaped
Earth, the moon cannot scrape 70% of the Earth's surface.
Even a shovel-shaped moon cannot scrape 70% of the Earth's
surface.

2. The oceanic crust is made of sima, not sial.

1. It was not hypothesized that a moon collided with the Earth,
but a Mars-sized body.

2. The impact was off-center, but not a "scooping" blow.

Where does your 70% come from?


.

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