Question

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

Answer 1

What unit and lesson is this?

Answer 2

Heyo?

Answer 3

unit 1 test

Answer 4

http://www.maximumachievementprogram.org/Earth_Science_Chapter_13_Section_1_Review.pdf

http://quizlet.com/45302539/chapter-13-flash-cards/

Answer 5

thank you so much

Answer 6

yea

Answer 7

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