Stromatolites are layered structures produced by the activity of 
A) dinosaurs.
B) methanogens.
C) cyanobacteria.
D) green algae.
Correct Answer:
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Q1: The cratonic platform of North America is
A)
Q3: Which gas found in today's atmosphere was
Q4: The Canadian Shield is
A) a low-lying region
Q6: There is a record of marine sediment
Q7: Collisions of continental crust blocks and fragments
Q8: Chalk rock containing fossils of algae and
Q9: Which of the following best describes the
Q11: Which of the following provides evidence of
Q12: Oxygen in the Earth's atmosphere is derived
Q17: The Earth became internally differentiated,with a metallic
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