01/08/2026
ππ An Earth Without Oceans? The Hadean Earth π¬β¨
Earth formed from planetesimals (relatively small celestial objects that existed in the early Solar System) approximately 4.5 billion years ago. πβοΈ During this early period, Earthβs surface temperature was above 1200Β°C, sustaining a global silicate magma ocean. ππ₯
π Outgassing: The Formation of Earthβs Water π§
With time, the mantle began to crystallize. Hydrous minerals such as ringwoodite broke down, releasing HβO and COβ. This process, known as outgassing, mainly occurred through volcanic activity. π
Once Earthβs surface temperature fell below the critical point of water, the basaltic crust (the current oceanic crust) began to thicken. Scientific models suggest that the released water v***r condensed into liquid water, and continuous rainfall over several thousand years gradually filled the ocean basins. π§οΈπ
βοΈ Water from Space? π
Lunar samples suggest that a period of intense bombardment, known as the Late Heavy Bombardment, occurred around 4.1β3.8 billion years ago. During this period, icy planetesimals and carbonaceous chondrites impacted the inner planets (planets located between the asteroid belt and the Sun).
These water-rich objects may have contributed to Earthβs ocean water; however, this hypothesis remains an actively debated scientific topic. ππ
π§ How Did the Ocean Become Salty? π
Slightly acidic rainwater interacted with rocks on land, causing erosion and releasing dissolved ions. These ions were transported through streams and rivers (runoff) and eventually reached the ocean. π§οΈποΈ
At the same time, seawater circulated through geothermally active hydrothermal vents on the seafloor. As seawater was heated and interacted with oceanic crust, minerals and salts were released back into the ocean. Over geological time, these processes gradually created the salty oceans we know today. ππ§
π From a molten planet to a blue planet the origin of oceans represents one of Earthβs greatest transformations, shaping the environment that supports life today. πβ¨
π References:
β’ Oceanβs Origin β EBSCO Research Starter
β’ Webb, P. (2019). Introduction to Oceanography. Rebus Community
β’ National Ocean Service (NOAA)
βοΈ Scientific Content Edited by
Pahan Bandara
π Society of Oceanography and Marine Geology (SOMaG)
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