In the early universe, when the Solar System had yet to be cleared of the debris out of which it formed, which type of object would have been most likely to deposit water onto Earth's surface?
A) comets
B) asteroids
C) a Mars-sized protoplanet
D) a rogue moon
E) none, because water is not a major component of any of the objects above

Question

Quizplus · Accepted Answer

Comets are made up of ice and dust, and they are believed to have delivered water to Earth during its early formation. They are thought to have formed in the outer regions of the solar system, where water was abundant, and then migrated inward toward the sun. As they approached the sun, the heat caused the ice in the comet to vaporize, creating a tail and depositing water and other volatile substances onto the inner planets, including Earth.

In the Early Universe, When the Solar System Had Yet