PBS Eons The Oxygen Catastrophe

What was the main topic introduced at the beginning of the video?

• The history of Earth

• The formation of the ozone layer

• The benefits of oxygen

• The dangers of too much oxygen

Tags

CCSS.RI. 9-10.2

CCSS.RI.11-12.2

CCSS.RL.11-12.2

CCSS.RL.8.2

CCSS.RL.9-10.2

During the Archaean Eon, what percentage of Earth's surface was dry land?

• 10-15%

• 20-25%

• 2-3%

• 50-60%

What color were the oceans during the Archaean Eon and why?

• Red due to iron oxide

• Green due to iron

• Blue due to clear water

• Green due to algae

What type of bacteria began producing oxygen around 2.3 billion years ago?

• Both Cyanobacteria and Halobacteria

• Halobacteria

• Cyanobacteria

• Anaerobic bacteria

What was the initial effect of oxygen produced by photosynthesizing bacteria?

• It caused immediate global warming

• It made the oceans blue

• It increased methane levels

• It reacted with iron in the oceans

What major climatic event was triggered by the reduction of greenhouse gases?

• Global warming

• Increased volcanic activity

• A massive drought

• The Huronian glaciation

How long did the Huronian glaciation last?

• 300 million years

• 400 million years

• 200 million years

• 100 million years

What was one of the consequences of the Oxygen Catastrophe for anaerobic microbes?

• They thrived and multiplied

• They were poisoned by oxygen

• They adapted to use oxygen

• They moved to land

What new atmospheric layer appeared after the Oxygen Catastrophe?

• Ionosphere

• Ozone layer

• Troposphere

• Stratosphere

What was the long-term impact of the Oxygen Catastrophe on life on Earth?

• Life became less complex

• Life became more complex and diverse

• Only anaerobic life survived

• All life was wiped out