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

Respuesta :

nicasivantniknik229 nicasivantniknik229

01-06-2017

I would say choice one, testing air bubbles in antarctic ice.

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