A. not only indicated a much older age of the Earth than Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but providing the mechanism of extra heat as well which would keep
Comparison incorrect
But Providing - Parallelism incorrect
B. not only indicated a much older age of the Earth than did Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but also provided the mechanism of extra heat, which keeps
Looks good, although
...
Comparison incorrect
But Providing - Parallelism incorrect
B. not only indicated a much older age of the Earth than did Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but also provided the mechanism of extra heat, which keeps
Looks good, although
...
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