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The mesosphere is known as the layer of the Earth's atmosphere where meteorites typically burn up upon entering. This occurs because the mesosphere is characterized by decreasing temperatures at increasing altitudes and is located approximately 50 to 85 kilometers (about 31 to 53 miles) above the Earth's surface. As meteorites enter this layer, they encounter a significant amount of atmospheric resistance, causing them to heat up and eventually disintegrate. This is why we often see "shooting stars" or meteors, which are actually the remnants of these meteorites burning up in the mesosphere.

The other options relate to different aspects of the Earth's atmosphere. For example, the region where satellites orbit is primarily the thermosphere, which is above the mesosphere. The coldest layer of the atmosphere is often cited as the mesosphere, but it can vary based on specific conditions, which is why the focus on meteorite activity is more definitive for this layer. Lastly, the closest layer to Earth's surface is the troposphere, making it distinct from the characteristics of the mesosphere.