Question

2. The expansion of crust on the continental
(b) 15 km
(d) 50 km
3. The expansion of crust on the ocean floor
masses is about
(a) 10 km
(d) 35 km
is about
(a) 2 km
(c) 11 km
(b) 5 km
(d) 25 km
The main mineral constituents of the
continental mass are
(a) Silica and Alumina
(b) Silica and Magnesim
(c) Silica and Copper (d) None of these
The oceanic crust is made of
(a) Silica and Nickel
(b) Silica and Magnesium
(c) Silica and Copper (d) None of these
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Answer 1

Answer:

1ka 2 Joshua BBC but I don't know what I want to be a good

Answer 2

Answer:

3 is 35 km answer

silica and alumina

silica and magnesium