QUIZ 1.1a Composition of the Earth's atmosphere

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(a) earth02.gif(a) The Earth is surrounded by an atmosphere made up of a of of different molecules.

(b) oxygen1nonanim.gif(b) The atmosphere mainly consists of 78% , 21% and 1% .

(c) The atmosphere also contains small amounts of vapor and .

(d) Because the atmosphere is a gas there are large between the , so gases like air have a very low .