Question

why are the interior planets are Rocky​

Answer 1

The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases on the surface to condense to solid particles.

Answer 2

Explanation:

Hey dear...☺

Answer..✍

so only heavy weight dense metals such as iron,magnesium were left thus,

the surface becomes rocky.whereas,

if you see outer planets,they have a thick envelope of lightweight gases.

these gases can't escape because the sunlight does not reach the surface of the planets and these gases can't evaporate.

☺✌Hope this helps you☺✌