Begining of the earth and moon ??

Question

can sum1 answer this fill in the blank Q plz :

1.At the begining the earth was _____ molten whereas the moon was _____ molten. This was because the earth is ______ than the moon.

2.Thanks to measurements on ______ rocks we have been able to find out that the earth is around _______ years old .

Answer 1

part 2 is moon rocks around 4.5 billion.

part one - not sure. I know when the moon was formed it was molten.