Earth's History Quiz

What is the purpose of the geologic time scale?

• To measure the age of Earth

• To describe the development of Earth

• To recognize major events in Earth's history

• All of the above

How old is Earth approximately?

• 4.54 trillion years

• 4.54 billion years

• 4.54 million years

• 4.54 quadrillion years

Which eon is often placed under a 'supereon' known as Precambrian?

• Hadean Eon

• Archean Eon

• Proterozoic Eon

• Phanerozoic Eon

Which era is not divided into periods?

• Archean Era

• Proterozoic Era

• Hadean Era

• Phanerozoic Era

How many important periods are there in the Phanerozoic Eon?

• 15

• 6

• 9

• 12

What are the early eons defined by?

• Formation of the solar system

• Mass extinctions

• Emergence of specific life forms

• Development of physical features of Earth

When did Earth form?

• Approximately 4.6 quadrillion years ago

• Approximately 4.6 trillion years ago

• Approximately 4.6 billion years ago

• Approximately 4.6 million years ago

What happened during the Late Heavy Bombardment?

• Intense bombardment of Earth with asteroids and comets

• Development of multicellular life

• Formation of Earth's atmosphere

• Emergence of cyanobacteria

What caused the Great Oxygenation Event?

• Introduction of oxygen by cyanobacteria

• Intense volcanic activity

• Emergence of multicellular life

• Climate change

When did multicellular life emerge?

• 550 million years ago

• 486 million years ago

• 400 million years ago

• 434 million years ago