The purpose of ice core drilling is to analyze trapped ancient bubbles of atmosphere for ________ and ________.
A. CO2 and Hydrogen isotopes
B. Helium and Hydrogen
C. CO and Hydrogen isotopes
D. CO2 and Oxygen isotopes
Answer: D
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The oldest rocks that have been dated by radioactivity are approximately
A. 4 billion years old. B. 2 million years old. C. 200 million years old. D. 10 billion years old.
What is a lingua franca and why is it important?
What will be an ideal response?
In order for an embayment to qualify as an estuary, it must have both ________ and ________.
A. dilution; some degree of isolation B. high evaporation; some degree of isolation C. equal evaporation and dilution; no isolation D. high evaporation; circulation E. dilution; no physical isolation from the oceans
A dynamic high-pressure area at the surface is closely associated with strong ________
A) ascent of air B) descent of air C) winds D) storms E) tornadic spin