Vironmental Science CP Summer 2021 (Scott) / My courses / Environmental Science CP Summer 2021 (Scott) / Unit 7: The Atmosphere / 7.8 Unit 7 Test
In 1
The earliest atmosphere on earth was composed of
ed
Select one:
out of
O a Oxygen, Carbon Dioxide, and Nitrogen
O b. Caron Dioxide, Steam, Nitrogen, Methane, and Ammonia
O c. Hydrogen and Helium