How are eras and periods of the geologic time scale named?
Scientists used [___] dating to determine Earth’s age.
radiometric
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oceansfossilsthe atmosphere
PrecambrianPaleozoicCenozoic
before after during
From what material did the moon form?
Use the drop-down menus to match each description to the geologic era it describes.
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Paleozoic MesozoicCenozoic
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
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Paleozoic Mesozoic Cenozoic
PaleozoicMesozoic Cenozoic
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