Which planet is known as blue planet?

Options

A. Jupiter
B. Neptune
C. Earth
D. Mars

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which planet is known as the "blue planet."

2. **Analyzing the Options**: The options provided are:
- A) Jupiter
- B) Neptune
- C) Earth
- D) Mars

3. **Identifying Characteristics of Each Planet**:
- **Jupiter**: Known for its gas giant status and Great Red Spot, but not associated with the color blue.
- **Neptune**: Often referred to as the blue planet due to its blue color, which is a result of methane in its atmosphere.
- **Earth**: Known as the blue planet because about 71% of its surface is covered by water, giving it a blue appearance from space.
- **Mars**: Known as the Red Planet due to its reddish appearance from iron oxide on its surface.

4. **Conclusion**: While Neptune has a blue color, Earth is commonly referred to as the "blue planet" because of the vast amounts of water covering its surface.

5. **Final Answer**: The planet known as the blue planet is **Earth**.

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