The stratosphere
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The ionosphere is the layer of the atmosphere that reflects radio waves. This layer is able to reflect specific frequencies of radio waves back to Earth, allowing for long-distance communication using radio signals.
Ozone layer filers the UV rays.
Well to maintain the oxygen in the earth atmosphere you need to make sure that the level of global warming is decreasing and less fumes will be able to make up the ozone layer. With a thinner layer around the earth this means that oxygen will be able to enter and exit the earths surface, allowing oxygen to still stay in the atmosphere.
Because people are not able to fly without a airplanes.
Yes, sound can travel in the atmosphere of the moon, but it would be very different from sound travel on Earth due to the moon's thin atmosphere. Sound waves would propagate through the moon's atmosphere much slower and with less intensity than on Earth. Additionally, the lack of air molecules on the moon means that sound would not be able to travel very far.
They invented the first airplane and if we didn't have airplanes we wouldn't be able to travel across the oceans or to different states fast.
The ionosphere layer of the atmosphere is where reflection of waves for worldwide radio communications takes place. This layer is able to reflect radio waves back to Earth, allowing for long distance communication via the ionosphere's ionized particles.
Since we have an atmosphere that is made up of 4 layers. One the most outer layer the thermosphere. Then the 3 most outer layer is the mesosphere. Next is the Stratosphere the third most outer layer. Last the closest layer the Troposphere which is where we all live.
Airplanes changed the way of life for many because it meant being able to travel long distances in a very short amount of time. What might take 6 hours to drive will only take 1 hour to fly.