The Evolution of Earth's Atmosphere

The video explores the conditions on early Earth over 4 billion years ago, highlighting the inhospitable atmosphere filled with deadly gases like methane and ammonia. Over time, these gases transformed into nitrogen, hydrogen, and carbon dioxide. Water vapor, emitted from Earth's interior, condensed as the planet cooled, leading to the formation of the first oceans.

What would have been a major challenge for humans on early Earth?

• Extreme cold temperatures

• Presence of deadly gases

• Lack of sunlight

• High levels of oxygen

Which gases were believed to be present in Earth's atmosphere 4 billion years ago?

• Hydrogen and helium

• Carbon dioxide and oxygen

• Methane and ammonia

• Oxygen and nitrogen

What process led to the breakdown of methane and ammonia in the early atmosphere?

• Meteor impacts

• Chemical reactions over time

• Photosynthesis

• Volcanic eruptions

How did water vapor contribute to the formation of oceans on early Earth?

• It evaporated into space

• It condensed into liquid water

• It froze into ice caps

• It was absorbed by plants

What was the source of water vapor on early Earth?

• Comets

• Earth's interior

• Atmospheric condensation

• Ocean evaporation