The borders (coastlines) of the continents underwent a number of changes
since the split. Often, chunks of land were washed away with water,
slowly or in bigger portions. The coast was generally "smoothed" by the
ocean currents too, and in some places more land was added with the
material that the ocean currents brought. 
Then, the tectonic plates continue to move, so this adds to the changes of the shape of the continents.  
        
                    
             
        
        
        
Weak acids do not and cannot dissolve in water. They become even more diluted, or watered-down, and become even weaker acids.
        
             
        
        
        
Answer:
well childhood disease is diseases that happens in childhood like chickenpox and etc 
I hope it helps 
 
        
                    
             
        
        
        
Answer:
The correct option is D) The age-structure diagram would be column-shaped with all age classes approximately equal.
Explanation:
A zero population growth refers to a condition when the birth rate equals to the death rate. Social workers tends to find methods to attain zero population growth as such conditions provide economic stability. As the birth rate and the death rate will be equal hence the age structure diagram of such a population can be seen to be column shaped as they all will be equal. 
 
        
             
        
        
        
The answer is B. Water/H2O