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Layers of the atmosphere, with the names of "scientists" that make us feel experts when we study them as children and then we forget at dinner because we almost never use them, unless we choose a job that leads us to study them better. Deep down, at high altitude. It is fascinating to explore them features that they have to do with many aspects of daily life even if it is difficult to imagine.
Layers of the atmosphere: what are they
The main layers are 5, they are imaginary layers that do not have a boundary marked by a line, but that can be easily identified thanks to their physical and chemical characteristics. There is the Troposphere, whose name derives from the Greek and means "sphere of change", then there are the Stratosphere, Mesosphere and Thermosphere, whose name, also from the Greek thermòn, recalls the idea of heat. The most external is theExosphere.
Layers of the atmosphere images
Layers of the earth's atmosphere
Before dividing it into layers and analyzing them one by one, let's see what we mean by earth's atmosphere. It is a gas envelope that covers the planet Earth, characterized by a rather complex structure.
Its layers, as we have noted, seen like “spheres”, they start from the bottom and advance in order of altitude, from the troposphere up to the exosphere, the layer is changed every time it is recorded an inversion of the vertical thermal gradient, passing from one sphere to another, there is a pause, a discontinuity always in terms of the thermal gradient. In the earth's atmosphere we find also the ionosphere and the ozonosphere which will soon be described.
Atmosphere layers for children
To teach children or review the layers of the atmosphere as adults who are a little lazy, we can browse the book "The atmosphere and the greenhouse effect”Written by Valérie Masson-Delmotte and Marc Delmotte, fantastically illustrated by C. Dutertre and translated by M. Di Bari.
At 6 euros on Amazon you can find this interesting volume dedicated to children between 9 and 11 years old in which with simple words but without ever trivializing, the greenhouse effect is described, what is the use of carbon dioxide, climate change and all phenomena concerning the atmosphere and climate. It is not a study book, because the reader "listens" to what tells the grandfather of the protagonists, a researcher and retired scientist.
Layers of the atmosphere: characteristics
Let's start from Troposphere, layer closest to Earth, with an average radius of 11 km, at the equator even 17, at the poles of a maximum of 8 km. In this sphere the atmospheric phenomena and that is why the planes pass through it and then stay in the next sphere, the Stratosphere, which ranges from 11 km to 50 km and contains the Ozonosphere, a belt rich in ozone.
Self in the Troposphere the temperature decreases with altitude, in the Stratosphere it increases moving away from the Earth until you reach another change in gradient, when you then switch to Mesosphere, from 50 to 80 km of altitude. Here the temperature drops rapidly as the altitude increases up to -80 ° C, giving rise to fascinating phenomena such as noctilucent clouds (mesospheric polar clouds), composed of small ice crystals that produce glows when illuminated by the sun.
From 80 km onwards there is the Thermosphere, in which the temperature rises up to 1,200 ° C. Between Mesosphere and Thermosphere, between 70 and 1,000 km of altitude, we find the Ionosphere, a particular layer formed by gas particles that become electric due to solar radiation.
The outermost layer of the atmosphere is theExosphere, after which there is interplanetary space, here the gases are extremely rarefied and temperatures reach 2,000 ° C.
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