As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet? the planet started to cool and an atmosphere formed. the planet started to become round and heat up. the planet started to wobble and turned upside down. the planet started to compress rock and form more radioactive elements.

The planet started to cool and an atmosphere formed.

Explanation:

Due to the gravity of the planet the water retention capacity increased as the earth was warmed and hotter earlier and after this, the planet started to cool thus this led to the formation of a secondary atmosphere that was devoid of the carbon and the helium and the hydrogen gases and thus, planet started to cool first and also acquired its round shape. As particles and life began to settle and thus the planet sustains life as compared to the moon.

Answer:   [b]:   "cultural" .

He got it right defiantly right