Which statement best describes conditions on early Earth?
Hot with volcanic activity with magma ocean
Cold oceans
Dark and dusty with abundant water
Dry land covered with volcanic dust
Meteor and asteroid impacts during Earth's creation and radiation from nearby supernova are all reasons for which characteristic of early Earth?
Hot temperature
Habitable surface
Single moon
Rocky planet with no atmosphere
Which gas was in high concentrations in the early atmosphere, and later condensed to form Earth's oceans?
Oxygen
Sulfur oxides
Carbon dioxide
Water vapor
What gas was missing in Earth's early atmosphere?
Oxygen
Sulfur oxides
Carbon dioxide
Water vapor
The early Earth was so hot that it melted into magma. As it did so, the heaviest elements sank to the center and the lightest ones rose. What did the lightest elements form?