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"The theory is that after the core formed there was a meteoric shower that struck the Earth," says Willbold.

So science has had to come up with an explanation, and the answer currently favoured is - a meteoric shower.

While the precious fallout from this meteoric shower lay scattered on the surface of the moon, on Earth the planet's internal activity had churned it into the mantle too.

They are none the worse for passing through a meteoric shower of petty misfortunes.

Mr. Talmage tells us that his father was terrified by the meteoric shower that visited our earth in 1833.