******************


( )




************************************************** *********
( weathering and soil )
***************
********


************


.


solar system
******************










ATMOSPHERE
( )
**********************
( - )



( - - )



Hydrosphere
( )








Biosphere
( )
*************************


( )

( ) ( )

( + )


( )

************************************************** ******
the end





************************************************** *********
********* **********

the city

. ( - - ) ( )

( )





( )




( )

/

( )

( )


---------------------------------

*

*
( )

* ( - )

* ( )

* ( )

* ( twin cities )*

*

*

*

************************************************** *******
the end

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