3. (a) Continental mass constitutes silica and alumina.
(b) Oceanic crust consists of silica and magnesium.
(c) Mantle extends up to a depth of 250 km.
(d) The innermost layer is core
put x for wrong
(b) Oceanic crust consists of silica and magnesium.
(c) Mantle extends up to a depth of 250 km.
(d) The innermost layer is core
put x for wrong
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