Exploring the Geologic Time Scale

What is the largest division of the geologic time scale?

• Era

• Eon

• Period

• Epoch

Which of the following is the correct order of the geologic time scale from largest to smallest?

• Period, Era, Eon, Epoch

• Eon, Era, Period, Epoch

• Era, Eon, Epoch, Period

• Epoch, Period, Era, Eon

During which eon did the first known life forms appear on Earth?

• Phanerozoic

• Archean

• Proterozoic

• Hadean

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

• Cenozoic

• Mesozoic

• Paleozoic

• Precambrian

The extinction of the dinosaurs occurred at the end of which period?

• Jurassic

• Triassic

• Cretaceous

• Permian

Which epoch is known for the appearance of the first hominins?

• Holocene

• Pleistocene

• Miocene

• Pliocene

What is the current geological epoch?

• Holocene

• Pleistocene

• Miocene

• Anthropocene

Which period is known for the explosion of life forms, often referred to as the "Cambrian Explosion"?

• Ordovician

• Silurian

• Cambrian

• Devonian

Which of the following is NOT a key term related to the geologic time scale?

• Eon

• Era

• Epoch

• Galaxy

The "Age of Mammals" refers to which era?

• Mesozoic

• Paleozoic

• Cenozoic

• Precambrian