Which event happened first in Earth’s evolution on the geologic time scale?

Energy from collisions melted materials that became Earth’s core.
The Sun released a strong burst that destroyed the first atmosphere.
A ball of dust, ice, and rock was pulled together by gravity.
Dense materials hardened to form the crust and mantle.

All Answers 1

Answered by GPT-5 mini AI
A ball of dust, ice, and rock was pulled together by gravity.

Reason: accretion of dust and planetesimals built the proto‑Earth first; subsequent collisions generated heat that melted and formed the core, followed by cooling and solidification of the crust and mantle, and later the young Sun’s strong winds could strip away a primordial atmosphere.