If we assume that the top of Mt.Everest is the highest land mass on earth,hikers who scale its summit are standing in the

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The troposphere is the layer of the Earth's atmosphere closest to its surface, extending from the ground up to an average height of 7-20 km (depending on location). This is where all weather occurs and where nearly all human activity takes place, including hiking on Mt. Everest. The mesosphere and stratosphere are higher up in the atmosphere, and the ozone layer is located within the stratosphere.

If We Assume That the Top of Mt