Explain why earth and other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago (mya).

The beginning of the Pre Cambrian is known as the Hadean eon. The planet was just born, and it was very very hot, and in fact molten. There were a lot of volcanic activities, and because of the way the solar system was created, there were still a lot of collisions between different bodies

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