Composition of gases in the Earth’s atmosphere (summer exam) Flashcards
1
Q
The atmosphere refers to gases held above the Earth’s s_______ by g______.
A
Surface, gravity
2
Q
The proportion of gases in the atmosphere are:
About four-fifths (approximately 80%)
is what?
A
Nitrogen
3
Q
About one-fifth (approximately 20%) is what?
A
oxygen
4
Q
Small proportions (less than 1%) of other gases e.g. c_________d________, water vapour and m________.
A
Carbon dioxide, methane
5
Q
A
5
Q
Oxygen in the atmosphere is essential for all living things to stay a_____, and for the c_________ (burning) of f______.
A
Alive, combustion, fuels
