Geologic time scale

Geologic time begins with a long span of time called _____________ time.

• Precambrian

• Mesozoic

• Paleozoic

Geologist divide the time between the Precambrian and the present into 3 long units of time called _____________.

• periods

• eras

• cambrians

During the ____________________ era, life increased in complexity and Pangaea formed.

• Paleozoic

• Mesozoic

• Cenozoic

The ____________________ era is defined by dominance of dinosaurs and Pangaea breaking apart.

• Paleozoic

• Mesozoic

• Cenozoic

During __________________ era, mammals evolved to become the dominant land animals and the continent moved to their present-day positions.

• Cenozoic

• Paleozoic

• Mesozoic

At the end of _________________ period, major volcanic eruptions coincided with the impact of a huge asteroid

• Cretaceous

• Jurassic

• Triassic

Cambrian period had a duration of _______________ of years in the Paleozoic era.

• 56 million

• 41 million

• 25 million

Velociraptors lived about 80 million years ago, it was in _____________ period.

• Cretaceous

• Jurassic

• Triassic

Smilodon lived about 2.5 million years to 10,000 million years in ______________ era.

• Mesozoic

• Paleozoic

• Cenozoic

Precambrian time covers about 88 percent of Earth’s history, from 4.6 billion years ago to 541 million years ago.

(True or False)

• True

• False

• Unknown