Formtion Of The Earth Flashcards
1
Q
What are the main 2 gases in the atmosphere?
A
80% nitrogen and 20% oxygen
2
Q
Why did the amount of oxygen increase in the atmosphere?
A
Algae and plants evolved to photosynthesis which emits oxygen
3
Q
Why did the amount of co2 decrease in atmosphere?
A
Plants and algae took it in from photosynthesis and due to rock formations (fossils)
4
Q
Why do co2 amounts increase?
A
Human = fossil fuels, deforestation, combustion
5
Q
How do you test for hydrogen
A
Light splint. Hold over test tube. Squeaky pop
6
Q
Test for oxygen gas
A
Glowing splint on top of tube, splint will relight
7
Q
Carbon dioxide test
A
Turns limewater cloudy
8
Q
Chlorine gas test
A
Bleaches damp litmus paper
9
Q
How were oceans formed?
A
Water vapour condensed
