History of Earth Part I-Eons and Eras

Name the first of Earth's four Eons.

This Eon is not part of pre-cambrian time.

Reptiles and dinosaurs dominated during which Era of the Phanerozoic?

The Cambrian Explosion started which Era of the Phanerozoic?

Which is the oldest of the three Eras?

The K-T Extinction event ended which Era of the Phanerozoic

This Era is known as "the age of the amphibians".

The continents and oceans formed during which Eon?

"Cenozoic" means _______.

What does "Paleozoic" mean?

This Era is known as "the age of the mammals".

Dinosaurs lived during the "Mesozoic", or _______.

Trilobites dominated during which Era of the Phanerozoic?

Which Era do we currently live in?

This Era is known as "the age of the reptiles".

During which Eon did photosynthesizers change the atmosphere to oxygen-rich?

This Eon is also known as the Eon of "Visible Life".

Earth was completely molten during which Eon?

The Permian Extinction ended which Era of the Phanerozoic?

Amphibians dominated during which Era of the Phanerozoic?

Mammals dominated during which Era of the Phanerozoic?