PITTSBURGH (KDKA) - I like to think of the atmosphere as sort of a big sandwich since the atmosphere isn't just one layer. It has many distinct layers from the ground all the way into space.

The troposphere is the lowest and densest layer of the atmosphere and according to NIWA, approximately 75% of all the air in the atmosphere is found in this layer. The troposphere extends from ...

This is where all of your typical weather happens ... The stratosphere is full of ozone. This is is the layer of the atmosphere that protects us from the harmful ultraviolet rays of the sun.

But when I am talking about the atmosphere, I am referring to the layer closest to Earth, the troposphere, where all weather occurs. Of course, there are multiple layers to the atmosphere.