Question 1
What is the most widely accepted main source of Earth's water?
Question 2
What does the term outgassing mean in the context of Earth's early history?
Question 3
Why is Earth's distance from the Sun important for the presence of liquid water?
Question 4
Which evidence best supports the idea that water was present very early in Earth's history?
Question 5
Which description best matches the role of comets and asteroids in Earth's water origin?
