My Short Notes
 

[COLOR="SeaGreen"][SIZE="6"]Atmosphere of Earth[/SIZE][/COLOR]
[COLOR="Black"]That the atmosphere of the earth is divided in to four categories, which are 1.Troposhere, 2.startosphere, 3.Mesosphere, 4.Thermosphere /Ionosphere, which are respectively described in brief as under:-[/COLOR]
1.Troposphere.
this atmospheric sphere starts from the surface of the earth to an altitude of 40,000ft, all the clouds and wind storms happens to be in this sphere.
2.Startosphere.
That this sphere starts after an altitude of 20 kilometers up to 30 kms, the ozone layer which protects the earth from ultraviolet radiation of the sun is present in this sphere, and from the environmental point of view there is little bid movements
3.Mesosphere.
That this sphere is present after the territory of stratosphere in the altitude and is below the ionosphere.
4. Thermo sphere/Ionosphere.
That the thermo sphere starts from an altitude of 50 km upto 250km, and due to presence of ions in this sphere is also called ionosphere.

Feed Back Mechanism
 

[COLOR="RoyalBlue"][SIZE="5"]FEED BACK MECHANISM[/SIZE][/COLOR]
[B][I]The feed back mechanism is a controlling system in the human body which controls the product of the hormones by the ductless glands in the human body, just as the thyroid gland produce the hormone which is called thyroxine, whose production by the thyroid is checked by the pituitary gland based in the brain, and like the ovary a gland of female which produce the hormone namely estrogen by which the process of a new child take place in the female after the cohabit ion with the male, the production of said estrogen is checked out by the pituitary gland, and this all system take place by the circulatory system in the human body [/I][/B]

Ecosystem
 

[COLOR="blue"][SIZE="5"]ECOSYSTEM[/SIZE][/COLOR]
[B]This system is known as ecosystem or ecological system with the interaction of the community with the environment, in the ecosystem the organisms take necessary material and energy for the survival, and they transfer back the material to the environment their decay or death. In a normal ecosystem these materials are constantly recycled (cabon, hydrogen, oxygen, nitrogen, phosphorous etc).
Our solar system is an ecosystem and for the survival of any ecosystem is is quite necessary that the energy must be suppied to it constantly, like the energy of the sun is being constantly provided to the earth and its organisms, an ecosystem is never static as the organ living in it are always interacting, not only with one an other but with the environment also.[/B]