The line where the earth seems to meet the sky
A.
B.
C.
D.
Answer & Solution
Solution:
Horizon is
the apparent line where the earth and sky meet.
Firmament
(A) refers to the sky or heavens, but not the line where earth and sky appear
to meet.
Rainbow (C)
is a meteorological phenomenon, not a line.
Orbit (D) refers to the path of a celestial body, not the line
where earth and sky meet.

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