abbeyseiberling abbeyseiberling
  • 01-06-2017
  • Social Studies
contestada

Scientists determined the historic levels of carbon dioxide in the Earth’s atmosphere by _____.


1. testing air bubbles in Antarctic ice

2. testing soil samples all over the world

3. evaluating tree ring growth

4. mapping the growth of redwood trees

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nicasivantniknik229
nicasivantniknik229 nicasivantniknik229
  • 01-06-2017
I would say choice one, testing air bubbles in antarctic ice. 
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