Cap Carbonates Resting Directly on All Three Neoproterozoic Tillites Indicate

question 4

Multiple Choice

Cap carbonates resting directly on all three Neoproterozoic tillites indicate that perhaps

• A) glaciers of "snowball Earth" reached the tropics.
• B) submarine volcanism ceased and with it carbon dioxide release as well.
• C) there was a mass extinction occurred among the cyanobacteria.
• D) frozen methane hydrates suddenly thawed out.

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