Approximately how long was a day on Earth when it formed 4.54 billion years ago?

• 24 hours 
• 6 hours 
• 10 hours

What is the name of the hypothesis that the Earth froze over 650 million years ago?

• Frosted Earth 
• Snowball Earth 
• Iced Earth 

What is the name of the supercontinent that existed before breaking apart into the continents we have today?

• Pangaea
• Panem
• Pleiades

When was the first flower produced by a plant on Earth?

• Between 250 - 140 million years ago
• Between 450 - 320 million years ago
• Between 630 - 510 million years ago

Approximately what percentage of marine animals were lost in the Earth’s greatest extinction period?

• 75%
• 52%
• 96%