How are eras and periods of the geologic time scale named?
Scientists used [___] dating to determine Earth’s age.
radiometric
PaleozoicMesozoic Cenozoic
oceansfossilsthe atmosphere
PrecambrianPaleozoicCenozoic
before after during
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.
From what material did the moon form?
Which processes produced heat that contributed to the formation of Earth’s different layers? Check all that apply.collision of materialscompaction of materialscooling of low-density metalsradioactive decaysinking of high-density metals
Paleozoic Mesozoic Cenozoic
Paleozoic MesozoicCenozoic
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