How did the water came in the Earth
Answers
Explanation:
The origin of water on Earth is the subject of a body of research in the fields of planetary science, astronomy, and astrobiology. Earth is unique among the rocky planets in the Solar System in that it is the only planet known to have oceans of liquid water on its surface.[2] Liquid water, which is necessary for life as we know it, continues to exist on the surface of Earth because the planet is at a distance far enough from the Sun that it does not lose its water to the runaway greenhouse effect, but not so far that low temperatures cause all water on the planet to freeze, known as the habitable zone.
Water covers about 71% of Earth's surface[1]
It was long thought that Earth’s water did not originate from the planet’s region of the protoplanetary disk. Instead, it was hypothesized water and other volatiles must have been delivered to Earth from the outer Solar System later in its history. Recent research, however, indicates that hydrogen inside the Earth played a role in the formation of the ocean.[3] The two ideas are not mutually exclusive, as there is also evidence water was delivered to Earth by impacts from icy planetesimals similar in composition to asteroids in the outer edges of the asteroid belt.[4]
Water is abundant in space and is made up of hydrogen created in the Big Bang and oxygen released from dying stars. ... Earth was moulded from rocks that came from the inner solar system where the fierce heat of the Sun would have boiled away any water. So, according to the textbooks, water must have come later.