Answer:
It might include things like definitions, historical context, current events that have bearing on your writing, or other information. Background information does not directly support your thesis in an essay or paper, but it is necessary for your reader to understand your thesis.
Explanation:
The Earth is roughly a sphere. The Earth is an irregularly shaped ellipsoid.
Gamma rays, x-rays, ultraviolet, infrared, microwaves, radio waves
Yes, many in the Rocky Mountains and Southern and Northern California
