2nd Q: Lesson 3: Geologic Time Scale

divides up the history of the earth based on life forms that have existed during specific times since the creation of the planet.

The earliest and longest part of Earth’s history, covering about 88% of geologic time.

Means “ancient life,” lasting from about 541 to 252 million years ago.

Known as the “Age of Reptiles,” lasting from about 252 to 66 million years ago.

Known as the “Age of Mammals,” beginning about 66 million years ago and continuing today.

Era where the Earth’s crust, atmosphere, and oceans formed.

Era where the first simple life forms, such as bacteria (microbes) and algae, appeared in the ocean.

The _______ happened when cyanobacteria produced oxygen through photosynthesis.

when did the Great Oxygenation Event happen?

Marked by major changes and diversification of life (Cambrian Explosion).

era where Marine life thrived with trilobites, brachiopods, and the first fish.

era where Plants, insects, and amphibians began to live on land.

era where Major geological events included the formation of supercontinents and mountain ranges

Paleozoic era ended with the largest mass extinction called?

Permian Extinction happened on the era of __________

era where Dominated by large reptiles and dinosaurs, with the first mammals and birds appearing.

era where Flowering plants (angiosperms) emerged and spread widely.

era where The continents began to drift apart as Pangaea broke up

Warm climate supported lush vegetation and diverse ecosystems.

Ended with a mass extinction (K-Pg Extinction) likely caused by an asteroid impact.

Mesozoic Era was ended with _________ extinction

era where Mammals became the dominant land animals after the extinction of dinosaurs.

era where Birds, flowering plants, and insects flourished.

era where Earth’s climate cooled, leading to several ice ages.