What is the atmosphere? where is earth’s atmosphere located, and what does it contain?

There are 5 key layers of the atmosphere: Troposphere here, Stratosphere , Mesosphere , Thermosphere, and Exosphere.

The atmosphere is an outer layer of gases surrounding the earth. Containing 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide. Also containing water vapor and other small gases.

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!