Question

order these events from oldest (1) to most recent (4).
dense melted material sank to form the core.
earths gravity captured gases to form the first atmosphere.
dust, rock, and ice were pulled together by gravity.
less dense material cooled, hardened, and formed the crust.

Explanation:

The formation of Earth began with dust, rock, and ice being pulled together by gravity (this is the initial stage of planet - building). Then, dense melted material sank to form the core (as the planet differentiated). After that, less - dense material cooled, hardened, and formed the crust. Finally, Earth's gravity captured gases to form the first atmosphere (once the basic structure of the planet was in place).

Answer:

1. Dust, rock, and ice were pulled together by gravity.
2. Dense melted material sank to form the core.
3. Less dense material cooled, hardened, and formed the crust.
4. Earth's gravity captured gases to form the first atmosphere.