TED-Ed: Where did Earth's water come from? - Zachary Metz

Water, a vital component of Earth, is abundant here but rare in the solar system. It formed from hydrogen and oxygen through nucleosynthesis in stars and was spread by supernovas. Theories suggest water arrived on Earth via asteroids or was present during its formation. Recent research indicates Earth may have retained water early on, challenging previous beliefs. Understanding water's origin helps us comprehend life's early development on Earth.

What percentage of the Earth's surface is covered by water?

• 70%

• 60%

• 80%

• 50%

Which process is responsible for the formation of heavier elements like oxygen in stars?

• Evaporation

• Combustion

• Nucleosynthesis

• Photosynthesis

What is the process called that led to the formation of Earth's first atmosphere?

• Precipitation

• Condensation

• Outgassing

• Sublimation

Which celestial bodies are believed to have brought water to Earth according to one theory?

• Stars

• Moons

• Planets

• Comets and asteroids

What recent evidence suggests that Earth may have had water early on?

• Solar winds

• Ocean currents

• Carbonaceous chondrite meteorites

• Volcanic eruptions