The Impossible Hugeness of Deep Time

How many years is 1 billion seconds?

• 3 years

• 13 years

• 31.7 year

Which of the following gases was NOT originally in Earth's atmosphere?

• ammonia

• methane

• carbon dioxide

• oxygen

Which happened first?

• Formation of liquid water

• Formation of Earth's atmosphere

• Invention of bitcoin

Life first appeared on Earth 1 billion years after the planet was formed. When did life first show up?

• 4.5 billion years ago

• 3.5 billion years ago

• 2.5 billion years ago

• 1.5 billion years ago

Which of the following is FALSE about oxygen gas appearing in the atmosphere?

• It was the waste product of cellular respiration

• It happened thanks to cyanobacteria

• It caused a mass extinction

What happened 2.2 billion years ago?

• Prokaryotes evolved

• Eukaryotes evolved

• Photosynthesis evolved

• Water liquified

Place the following events in order from longest ago to most recent:​ (a)   ​ (b)   ​ (c)   ​ (d)   ​ (e)   ​ ​

• Land plants
• Insects
• Reptiles
• Flowering plants
• Mammals