How are eras and periods of the geologic time scale named?
oceans✔ fossilsthe atmosphere
✔ PrecambrianPaleozoicCenozoic
before ✔ after during
Fill in the blanks to complete each statement about the age of Earth.
⇒ radioactive
radioactive
Order these events from oldest (1) to most recent (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
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
Use the drop-down menus to match each description to the geologic era it describes.
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