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1. 
It is the most superficial layer of the Earth. It can be oceanic or continental.
A.
core
B.
layer
C.
crust
D.
mantle
2. 
It is the intermediate layer.
A.
mantle
B.
crust
C.
core
D.
layer
3. 
It is the most internal layer of the Earth. One part is solid and the other part is liquid.
A.
layer
B.
crust
C.
mantle
D.
core
4. 
It is a single thickness of a material covering a surface or forming an overlying part or segment.
A.
core
B.
layer
C.
crust
D.
mantle