Question

multiple select question
select all that apply
which of the following statements correctly describe the keeling curve?
the data for the curve have been measured at mauna loa observatory, hawaii.
the curve is very smooth.
it is a graph of co₂ concentrations in the atmosphere over the past 50+ years.

Explanation:

The Keeling curve data has been measured at Mauna Loa Observatory in Hawaii and it represents atmospheric CO₂ concentrations over more than 50 years. However, it has seasonal fluctuations and is not very smooth.

Answer:

A. The data for the curve have been measured at Mauna Loa Observatory, Hawaii.
C. It is a graph of CO₂ concentrations in the atmosphere over the past 50+ years.