Geologic Time Scale and Earth's History Quiz

What does the term 'Hadean' refer to in geological time?

• The first Eon of Earth's history characterized by extreme volcanic activity
• A period of peaceful planetary formation
• A time when life was already complex
• The era of dinosaur dominance

Which scientist first proposed laws of stratigraphy in 1669?

• William Smith
• Nicolas Steno
• Giovanni Arduino
• Charles Darwin

What significant event occurred 2.5 billion years ago during the Proterozoic Eon?

• Dinosaurs first appeared
• Photosynthetic bacteria released massive amounts of oxygen
• Humans evolved
• Continents fully formed

What does the term 'Phanerozoic' mean?

• Hidden life
• Invisible organisms
• Visible life
• Ancient creatures

Which event marked the beginning of complex animal life with mineralized remains?

• The Great Dying
• The Cambrian Explosion
• The K-Pg Extinction
• The Ice Age

What percentage of marine species disappeared during the Great Dying extinction event?

• 50%
• 75%
• 96%
• 25%

Which era is often referred to as the 'Age of Reptiles'?

• Paleozoic
• Cenozoic
• Mesozoic
• Proterozoic

What caused the K-Pg Extinction Event?

• Volcanic eruptions
• A massive asteroid impact
• Climate change
• Meteor shower

Which group of organisms survived the K-Pg Extinction Event?

• Dinosaurs
• Mammals
• Birds
• Reptiles

When did the first primate walk upright?

• 2 million years ago
• 7 million years ago
• 15,000 years ago
• 40 million years ago