Question

a graph of the carbon dioxide levels in the earths atmosphere is shown below.
carbon dioxide in the earths atmosphere
which of the following is true?
a. the steepest increase in carbon dioxide levels took place in the 18th century
b. the carbon dioxide levels in the atmosphere began increasing rapidly around 1950
c. carbon dioxide levels in the atmosphere have been dropping steadily since 1750.
d. the level of carbon dioxide in the atmosphere did not change before 1900.

Explanation:

Step1: Analyze Option A

The 18th century is around 1700 - 1800. From the graph, the slope (rate of increase) in the 18th century (around 1750 - 1800) is much less than later periods, especially after 1950. So A is false.

Step2: Analyze Option B

Looking at the graph, around 1950, the slope of the graph (rate of increase of CO₂ concentration) becomes much steeper, indicating a rapid increase. This matches the description in B.

Step3: Analyze Option C

The graph shows CO₂ levels increasing (since the y - axis value is rising) from 1750, not dropping. So C is false.

Step4: Analyze Option D

Before 1900 (from 1750 - 1900), the graph shows a gradual increase in CO₂ levels, so the level did change. Thus, D is false.

Answer:

B. The carbon dioxide levels in the atmosphere began increasing rapidly around 1950