MCQ Detailed View

The correct answer is Earth. Our planet is called the Blue Planet because more than 71% of its surface is covered with water. The oceans, rivers, lakes, and seas reflect sunlight in a way that gives Earth a blue appearance when viewed from space. This makes Earth stand out among all the planets in the solar system.

Water plays a central role in Earth’s identity as the Blue Planet. Oceans not only cover the majority of the surface but also regulate climate, absorb carbon dioxide, and produce oxygen through marine plants such as phytoplankton. This balance between water, air, and land makes Earth the only known planet that can support complex life forms.

Other planets do not share these features:

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  Mercury is a dry, rocky world with no significant atmosphere to hold water.

  
  


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  Venus has a thick atmosphere filled with carbon dioxide, making it extremely hot and uninhabitable.

  
  


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  Neptune appears blue because of methane gas in its atmosphere, but it is a cold gas giant with no surface or oceans like Earth.

  
  

Earth’s atmosphere is another key factor. It contains nitrogen, oxygen, carbon dioxide, and water vapor, which together sustain life and protect the planet. The ozone layer shields the surface from harmful ultraviolet radiation, while the presence of oxygen allows animals and humans to breathe.

In summary, Earth is called the Blue Planet because of its abundant liquid water, life-supporting environment, and blue reflection seen from space. This unique combination of features highlights Earth’s special place in the solar system.