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Earth Sciences 30 Online
OpenStudy (anonymous):

I need help i cant find these answers 14. Some continents contain large core areas of Precambrian rocks called ____. (1 point)  rifts  plateaus  shields 15. What is the major source of free oxygen in the atmosphere? (1 point)  water  green plants  silicate minerals

OpenStudy (here_to_help15):

What unit and lesson is this?

OpenStudy (here_to_help15):

Heyo?

OpenStudy (anonymous):

unit 1 test

OpenStudy (anonymous):

thank you so much

OpenStudy (anonymous):

yea

OpenStudy (inowalst):

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