Question

How do scientists test samples to determine how much CO2 was in the atmosphere in the past?(1 point)
Possible Answers:
Using ice core samples from glaciers that were formed over long periods of time.
Using weather balloons to trap samples of atmosphere
Using tree rings to establish rates of respiration for forests.
Using ocean samples to test acidity.

Answer 1

Using ice core samples from glaciers that were formed over long periods of time.