the atmosphere Flashcards
1
Q
what gasses were present in the early atmosphere
A
first volcanoes release carbon dioxide and water vapour (also small amounts of methane and ammonia)
then some of the carbon dioxide dissolved in the oceans to form weak acids which then reacted wiht salts in the ocean to form precipitates
2
Q
how was coal formed
A
from the reamains of ferns and trees in anaerobic conditions or when there is a lack of decomposers due to not having the right conditions. This is then compressed under high temperature and pressure
3
Q
how was oil formed
A
the remains of plankton being compressed by sediment under heat and pressure
4
Q
how was natural gas formed
A
natural gas is mainly methane and is found near oil as it is formed in a similar way to oil
