Put the following events in the order they occurred to lead to the formation of the solar system:
earth was bombarded by new materials after formation.
earth separated into layers based on the weight of materials.
hydrogen and helium formed atoms.
outgassing of volcanoes produced a primitive ocean.

Third → First → Second → Fourth

Explanation:

Initially helium and Hydrogen in abundance started to form atoms

Following the atoms formation by hydrogen and helium bombardment of new matter into the Earth took place.

The bombardment of matter resulted in separation of Earth into respective layers based on the weight of the matter.

A primitive ocean was created as a result of off gassing of the volcanoes.