Earth's Ancient Mysteries: A Science Study Guide Quiz

What era is known as the "Age of Reptiles"?

• Paleozoic

• Mesozoic

• Cenozoic

• Precambrian

Approximately how old is the Earth?

• 4.6 million years

• 4.6 billion years

• 2.5 billion years

• 10 billion years

Which period is known for the first appearance of dinosaurs?

• Triassic

• Jurassic

• Cretaceous

• Permian

What event marked the end of the dinosaurs?

• A massive volcanic eruption

• An ice age

• A meteorite impact

• A global flood

During which era did the first mammals appear?

• Paleozoic

• Mesozoic

• Cenozoic

• Precambrian

What is the name of the supercontinent that existed about 250 million years ago?

• Gondwana

• Laurasia

• Pangaea

• Rodinia

Which gas was not present in Earth's early atmosphere?

• Oxygen

• Nitrogen

• Carbon dioxide

• Methane

What process led to the formation of the Earth's oxygen-rich atmosphere?

• Volcanic eruptions

• Photosynthesis by early life forms

• Decomposition of minerals

• Solar radiation

Which era is known as the "Age of Fishes"?

• Paleozoic

• Mesozoic

• Cenozoic

• Precambrian

What marks the beginning of the Phanerozoic Eon?

• The appearance of complex life forms in the ocean

• The formation of the Earth

• The first land plants

• The extinction of dinosaurs