Which definition best describes global warming? a. a long-term change in the earth's climate b. a long-term increase in the earth's average temperature c. a long-term change in the climate of a region or a city d. solar heat that is radiated out into space

B) A long-term increase in the Earth's average temperature

Global warming is a slow but gradual increase of Earth's temperature caused by an increase in carbon dioxide and other factors.

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.