Eons Eras Periods Epochs

This is the model of Earth's history from its origin 4.6 billion years ago to the present.

• geologic time scale

• key beds

• index fossils

• major geologic events

Tags

NGSS.MS-ESS1-4

This is the present era. It began about 66 million years ago.

• Cenozoic

• Phanerozoic

• Quarternary

• Holocene

Tags

NGSS.MS-ESS1-4

This is the present period. It began about 2.6 million years ago.

• Quarternary

• Phanerozoic

• Cenozoic

• Holocene

Tags

NGSS.MS-ESS1-4

This is the present epoch. It began about 11,600 years ago.

• Holocene

• Phanerozoic

• Cenozoic

• Quarternary

Which eon represents the longest period of time?

• Precambrian

• Mesozoic

• Jurassic

• Paleozoic

Tags

NGSS.MS-ESS1-4

The blue highlighted portion refers to _______ on the geological time scale.

• Eons

• Eras

• Periods

• Epochs

Tags

NGSS.MS-ESS1-4

The Green highlighted portion refers to ____ on the geological time scale.

• Eons

• Eras

• Periods

• Epochs

Tags

NGSS.MS-ESS1-4

The pink highlighted portion refers to _____ on the geological time scale.

• Eons

• Eras

• Periods

• Epochs

Tags

NGSS.MS-ESS1-4

Which of the following is the primary reason for using the geologic time scale?

• To measure how long North America has existed

• To recognize major events that have occurred on Earth

• To explain how Earth was formed 4.6 billion years ago

• An explanation of how the dinosaurs disappeared

Tags

NGSS.MS-ESS1-4

During the Paleozoic Era, the continents were together in a super-continent known as ________.

• Pangaea

• Gondwana

• Pangaea Ultima

• Anteurasiafricalia

Tags

NGSS.MS-ESS1-4