Answer:(2010) analysed how individual components of the atmosphere contribute to the total greenhouse effect. They estimated that water vapor accounts for about 50% of Earth's greenhouse effect, with clouds contributing 25%, carbon dioxide 20%, and the minor greenhouse gases and aerosols accounting for the remaining 5%.
Explanation:
 
        
             
        
        
        
They are all freshwater. So the closest would be c. an estuary since it has a free connection with the sea since the sea is not freshwater.
So C.
hope this helps!
        
                    
             
        
        
        
Answer:
try to solve it on a paper
 
        
             
        
        
        
Answer: it's 3CO2+4H2O+Energy
Propane is a linear alkane of formula C3H8. It is mainly used as fuel (this is the main component of liquefied petroleum gas) in cooking and chemical industry reactions. 
The reaction of its complete combustion by the presence of oxygen is:
C3H8 (gas) + 5O2  ==> 3 CO2 + 4H2O + energy (2220⋅kJ)
As we can see, propane can release carbon dioxide and water as every combustion reaction, and a lot of energy in the form of heat.
 
        
             
        
        
        
Answer:
I believe a layer deep underground would have older things, because the ground could erode over time causing the fossil to sink into the ground.