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Asked by Sensoph Last Modified
Answer The ultimate source of water on Earth is believed to be from comets and asteroids that bombarded the early Earth during its formation around 4.5 billion years ago. These celestial bodies contained significant amounts of water in the form of ice, which was released upon impact and contributed to the formation of Earth's oceans, atmosphere, and surface water bodies.
This theory, known as the "late heavy bombardment" or "late veneer" hypothesis, suggests that water was delivered to the young Earth by icy planetesimals from the outer regions of the solar system. Over time, as the Earth cooled and solidified, water vapor in the atmosphere condensed to form rain, which filled depressions on the Earth's surface to create oceans, lakes, and rivers.
In addition to water from comets and asteroids, some water may also have originated from volcanic outgassing, where water vapor and other gases were released from the Earth's interior through volcanic activity. However, the majority of Earth's water is believed to have been delivered by cometary and asteroidal impacts during the early stages of the planet's formation.
Today, water is continuously recycled and redistributed through various processes such as evaporation, condensation, precipitation, runoff, and groundwater recharge. While the ultimate source of water on Earth can be traced back to extraterrestrial sources, the water cycle plays a crucial role in maintaining the distribution and availability of water on our planet.
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