Exploring the Geologic Time Scale: Eons, Eras, Periods, and Epochs

What is the primary purpose of the geologic time scale?

• To measure daily activities

• To understand the history of Earth

• To study the solar system

• To track human evolution

Tags

NGSS.MS-ESS1-4

What did geologists in the 19th century notice about sedimentary rocks?

• They were all the same color

• They were only found in certain regions

• They contained no fossils

• They had horizontal layers with different characteristics

Tags

NGSS.MS-ESS1-4

How do we typically measure the time it takes to complete daily chores?

• In hours

• In minutes

• In days

• In seconds

What is the largest division of the geologic time scale?

• Era

• Period

• Epoch

• Eon

Tags

NGSS.MS-ESS1-4

Which eon spans from the formation of the Earth to the appearance of multicellular organisms?

• Cenozoic

• Paleozoic

• Precambrian

• Mesozoic

Which era are we currently living in?

• Precambrian

• Cenozoic

• Mesozoic

• Paleozoic

What is the smallest division of the geologic time scale?

• Epoch

• Period

• Eon

• Era

Tags

NGSS.MS-ESS1-4

Which period is known for the presence of famous dinosaurs like the Tyrannosaurus Rex?

• Triassic

• Cretaceous

• Quaternary

• Jurassic

What marks the beginning of the Holocene epoch?

• The appearance of mammals

• The extinction of dinosaurs

• The end of the last ice age

• The start of human evolution

What do scientists use to define the boundaries between major divisions of the geologic time scale?

• Rock texture

• Fossil evidence

• Chemical composition

• Rock color

Tags

NGSS.MS-ESS1-4