Structure of the Earth

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  STRUCTURE OF THE EARTH1.ATMOSPHERE- it iscomposed of several layers of ases t!at s rro #d t!e eart!$.%&OSPHERE- it is composedof all livi# t!i#s o# t!epla#et.  '.(&THOSPHERE- it iscomposed of t!e eart!)s cr sta#d ma#tle  Lithos(stone or rocky) sphaira( sphere) *.Hydrosp!ere- it iscomposed of +ater i# all itsforms, solid, li id a#daseo s* MA& (A/ERS OF THE EARTHCRUST   T!e o ter layer of t!e eart!+!ic! is a0o t *-$ miles t!ic2co#sisti# of sa#d a#d roc2.(ays a0ove t!e ma#tle a#d ist!e eart!)s !ard o ter s!ell, t!es rface o# +!ic! +e are livi#. T!e cr st e3te#d do+#+ard fromt!e s rface to a# averaedept!of '2m +!ere t!e ma#tle0ei#s. T!e cr st is ric! i# eleme#t s c!as silico#, al mi#i m, calci m,sodi m a#d potassi m. $ 4&5S OF CRUST  a.COT&ETA( CRUST-forms t!e co#ti#e#ts. &t is t!edry la#d. T!is is t!e a0ovetype of cr st a#d made p of sial or silico#- al mi#i m roc.&t is 16-6 2m t!ic2 a#d oldert!a# ocea#ic cr st. 0.OCEA&C CRUST- it is t!e+et la#d. 7 8 16 2m t!ic2 a#dco#sists of dar2, de#sei#eo s roc2s, s c! as 0asalta#d a00ro. &t is composed of somatic or silico#- ma#esi m
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