Which of the following is one of the three factors that contribute to the periodic changes in Earth's temperature known as the Milankovitch cycles? (1 point)
Responses
Earth's orbit alternates between a circular and an elliptical shape
Earth's orbit alternates between a circular and an elliptical shape
The concentration of carbon dioxide in Earth's atmosphere is decreasing
The concentration of carbon dioxide in Earth's atmosphere is decreasing
Earth's atmosphere has been enriched in oxygen by cyanobacteria
Earth's atmosphere has been enriched in oxygen by cyanobacteria
Earth's shape is spherical