Question

use the graph to the right to answer questions 18 through 20. the graph shows data obtained from an ice core sample from vostok, antarctica.

1. approximately what was the highest level of atmospheric dioxide on this graph?

a. 300 ppm
b. 3℃
c. 400 ppm
d. 270 ppm
vostok, antarctica ice core data
temperature change (℃)
years before present (thousands)
co₂ concentration (ppm)

Explanation:

Step1: Locate CO₂ axis max

Identify the highest peak on the bottom axis (CO₂ Concentration in ppm).

Step2: Match peak to option

The peak reaches ~300 ppm, matching option a.

Answer:

a. 300 ppm