It isn't. Anything entering or reentering Earth's atmosphere heats up because of heat caused by friction between the air and the object.
Ozone is found mostly in the atmosphere. Inside the atmosphere, it is a layer inside another layer called stratosphere.
The outermost layer of Earth's atmosphere is the exosphere. This layer is where the atmosphere is the thinnest, gradually transitioning into space. The exosphere is composed mostly of hydrogen and helium atoms.
The layer of Earth's atmosphere that contains about 80% of the total mass of the atmosphere is the troposphere. This layer is closest to the Earth's surface and is where most weather phenomena occur.
The top layer of Earth's atmosphere is called the exosphere. It is the outermost layer where the atmosphere transitions into space. The exosphere is very thin and composed mostly of low-density gases.
stratosphere
Ozone is mostly concentrated in the atmosphere. There is a name for the layer called ozone layer.
The ozone layer is mostly affected the by the suns ultraviolet rays. This layer is present in the stratospheric region of atmosphere.
The thermosphere is so hot because sunlight strikes this layer of the atmosphere first.
Hot air balloons typically operate in the layer of the atmosphere known as the troposphere, which is the layer closest to the Earth's surface. This is where most weather events occur and where temperature decreases with altitude.
Hot air balloons typically fly in the layer of the atmosphere known as the troposphere. The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface up to about 10-15 kilometers (6-9 miles) in altitude.
No, it is a "sub-layer" mostly located within the stratosphere (app. 10-50 km above the Earth's surface), but exists in small quantities within all layers of the atmosphere. The Stratophere is the second-lowest layer of Earth's atmosphere and the ozone layer is located there.
The only layer I could think of would be the Thermosphere. The reason why this part of the atmosphere is so hot is that it is the top layer of the atmosphere.