Question

1. according to the nebular theory, the inner planets are primarily composed of metal and rock because... only those materials could resist the heat of the sun. the moons gravity pulled in heavier elements. those were the first substances formed during the birth of our solar system. the outer planets used up all the gasses due to their immense size and gravity.

Explanation:

The nebular theory posits that the inner planets are rocky because only materials that could resist the heat of the sun condensed to form them. The inner - region was too hot for lighter gases to condense, while heavier elements like metals and rocks could solidify.

Answer:

only those materials could resist the heat of the sun.