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Olympiad-Science
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Class 10
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Q)
The most abundant element in the earth's crust is ?
a
.
A
l
u
m
i
n
i
u
m
b
.
N
i
t
r
o
g
e
n
c
.
S
i
l
i
c
o
n
d
.
O
x
y
g
e
n
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