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P. 5
Engineering Geology
Second lecture
Earth installation
The Earth in geology is made up of five basic envelopes:
1- Atmosphere
2- Hydrosphere
3- Lithosphere
4- Biosphere
5- Interior of the Earth (the core of the Earth)
We will talk about each of them briefly
1- The atmosphere envelope
It is responsible for keeping humans in a constant state of warmth, because
without this envelope, the temperature of the earth may approach 100 degrees
Celsius below zero, and also it counteracts harmful cosmic rays and charged
particles as well as ultraviolet rays and absorbs some of them, however, it is
considered very small compared to the size of the earth Like paint on the surface
of the earth.
The atmosphere is divided into five main layers:
1. troposphere layer
2. stratosphere
3. mesosphere layer
4. ionosphere layer
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