Earth has no natural satellites. Earth's atmosphere is composed of gases. Water is found in all three phases on Earth. Volcanoes release liquid rock onto Earth's surface.
I gave my students this multiple choice question: All of the planets in the solar system formed at about the same time from a large cloud of gas and dust. How is Earth different from other planets in the solar system?

Only one answer is correct among these 4 choices:
- Earth has no natural satellites.
- Earth's atmosphere is composed of gases.
- Water is found in all three phases on Earth.
- Volcanoes release liquid rock onto Earth's surface.

Could you tell me which one is correct?

Water is found in all three phases on Earth.