(a) The Earth is surrounded by an atmosphere made up of a
of
. The atmosphere also contains small amounts of water vapor and carbon dioxide.
(b) The atmosphere mainly consists of 78%
, 21%
and 1%
. The atmosphere also contains small amounts of water
and
.
(c) Atmospheric
from human activity e.g.
burning adds small amounts of CO
, NO
x and SO
2 . Human activity also adds
carbon dioxide and particles of
to the atmosphere.