All of the following have occurred over long periods of time on Earth. Which one is not thought to have played a major role in long-term changes in Earth's climate?
A.)Changes in the Earth's axis tilt.
B.) A gradual rise in the atmospheric content of oxygen.
C.) Changes in the atmospheric concentration of greenhouse gases.
D.) Changes in the Earth's overall reflectivity.
A.)Changes in the Earth's axis tilt.
B.) A gradual rise in the atmospheric content of oxygen.
C.) Changes in the atmospheric concentration of greenhouse gases.
D.) Changes in the Earth's overall reflectivity.