Answers

2014-11-03T22:18:36+05:30
The upper layer on the earth is called as crust. the thickness of the crust is 30km to 50km .it comprises of 1% of the whole earth.
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2014-11-03T22:25:37+05:30
Crust 
rust is the thin solid layer covering the outside of the earth . the thickness of the crust differs from place to place. beneath the sedimentary rocks of the soild earth, the rocks are rich in sial ( silica + aluminium). sial is made up of lighter rock material and is on an average 35 km beneath the continents . beneath the sial layer lies sima, the rocks rich in silia and magnesium . sima is made up of heavier rock material and is on an average 4-7 km thick beneath the ocean .
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