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Plutonium is least likely to have been a component of Earth as it is a man-made element that is not naturally occurring in significant quantities.
Oxygen was least likely to have been a component of Earth's atmosphere before life began. It was initially scarce, and the atmosphere was primarily made up of gases such as methane, ammonia, water vapor, and carbon dioxide. Oxygen started to accumulate in the atmosphere following the emergence of photosynthetic organisms.
oxygen
The outer core, inner core, mantle, crust, water, atmosphere. This is the order from densest to least dense.
mesosphere
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High concentrations of water, carbon dioxide, and other volatile elements are least likely found in the Earth's mantle due to its high pressure and temperature conditions, which tend to drive these volatile components to the Earth's surface and atmosphere.
Nickel
Plutonium is least likely to have been a component of Earth as it is a man-made element that is not naturally occurring in significant quantities.
Nickel
Nickel
Oxygen was least likely to have been a component of Earth's atmosphere before life began. It was initially scarce, and the atmosphere was primarily made up of gases such as methane, ammonia, water vapor, and carbon dioxide. Oxygen started to accumulate in the atmosphere following the emergence of photosynthetic organisms.
oxygen
The layers of Earth's interior from least to greatest density are: Crust Mantle Outer core Inner core
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