question 2 of 10\nwhat happened around 800 million years after earth formed to allow rocks to form?\na. the…

Brief Explanations:

When Earth first formed, it was a hot, molten mass. Rocks could not form until it cooled down enough for the material to solidify. The ozone layer formed much later in Earth's history and is related to the presence of oxygen - producing life. Life began to appear after Earth had cooled and other conditions were right for its emergence. The sun has not dimmed considerably around that time - it has a long - term stable energy output on the scale of hundreds of millions of years relevant to this question.

Answer:

D. Earth cooled sufficiently.