Topic 8 - Earths Atmosphere Flashcards
1
Q
What gases make up the earths atmosphere today?
A
- oxygen
-nitrogen
-carbon dioxide
2
Q
What percentage of oxygen make up the atmosphere today?
A
21%
3
Q
What percentage of nitrogen makes up the atmosphere today?
A
78%
4
Q
What percentage of carbon dioxide make up the atmosphere today?
A
0.04 %
5
Q
What was the early atmosphere made of?
A
- carbon dioxide
- methane
- water vapour
- ammonia
6
Q
How were the oceans formed?
A
Water vapour from comets cooled and condensed to make rain
7
Q
How did oxygen appear?
A
- photosynthesising organisms appeared
- they took in carbon dioxide and released oxygen
- so then more complex organisms could evolve making more oxygen
8
Q
What is the test for oxygen?
A
- glowing splint (not on fire)
- relights in oxygen
9
Q
Test for carbon dioxide?
A
- bubble through limewater
- goes cloudy with CO2
10
Q
How is energy from the sun transferred to Earth?
A
By waves such as light and infrared
11
Q
Which gases are greenhouse gases?
A
- carbon dioxide
- methane
- water vapour
12
Q
How are the levels of carbon dioxide monitored?
A
- by satellite data
13
Q
How is methane produced?
A
By livestock farming and in rice paddy fields
