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german
3 years ago
6

Light elements like hydrogen and helium form a large percentage of the outer planets and Sun is made up primarily of hydrogen. W

hy are these elements nearly absent from the inner planets?
Geography
1 answer:
DiKsa [7]3 years ago
4 0

Answer:

<u>Instead of Helium and Hydrogen there are heavier elements in inner planets like Nitrogen and oxygen.</u>

Explanation:

  • As the inner planets like Mercury, Venus and Mars and earth have a solid surface which is separated by the Sharpe atmosphere, and their gravity is too low to hold these light gases.
  • Uranus is primarily composed of gases and ice of which 83% is hydrogen and 15% helium and rest are trace gases. As in the early composition of the atmosphere, the inner planets like the earth had a solid atmosphere composed of solid silicates elements like magnesium, iron, calcium, and potassium.  
  • As the earth has a highly unstable atmosphere only carbon, nitrogen and oxygen combined in lightning occur. And planet mercury has no atmosphere thus gravity is too low to hold any gas.
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