- What geological features tell us that water once flowed on Mars?
- Why did Mars change?
- Is Venus geologically active?
- Why is Venus so hot?
- What unique features of Earth are important for life?
- How is human activity changing our planet?
- What makes a planet habitable?
- Was there a volcano born last century on Earth?
- Which country witnessed a new volcano on February 20, 1943?
- Who was working on the field when the volcano was born?
Hint: Use Wikipedia (Paricutin)
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