Geologic Time Answers

How are eras and periods of the geologic time scale named?

oceansfossilsthe atmosphere

PrecambrianPaleozoicCenozoic

before after during

According to scientific evidence, Earth is approximately 4.6 [___] years old.

Scientists used [___] dating to determine Earth’s age.

1 2 3 4

1 2 3 4

1 2 3 4

1 2 3 4

Use the drop-down menus to match each description to the geologic era it describes.

Paleozoic Mesozoic Cenozoic

PaleozoicMesozoic Cenozoic