Answer:
SIAL SIMA · The upper layer of the crust is called the continental crust. · It mainly consists of granite rocks which are of lighter colour and density · The upper crust is rich in silicon (Si) and aluminium (A1). · For this reason, the upper or continental crust is also called Sial. · It is a discontinuous layer which forms the continents · The lower layer of the crust is the oceanic crust. · It consists of darker, denser basaltic rocks. · Rocks of the oceanic crust contain silicon (Si) and magnesium (Mg. · Therefore, the oceanic crust is also called Sima. · It is more or less a continuous layer and forms both the ocean floors and the base of the continents
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