Question

1. according to the nebular theory, the inner planets are primarily composed of metal and rock because...

• the moons gravity pulled in heavier elements.
• only those materials could resist the heat of the sun.
• 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 of the solar - nebula was hot, and only high - melting - point substances like metals and rocks could solidify there.

Answer:

Only those materials could resist the heat of the sun.