The correct answer is - deflation.
The process of deflation can be caused by the winds. It is an erosive process in which the main role has the wind that is carrying lot of sediment in the shape of very small particles with it. 
Through this process, the winds manage to erode large areas, especially in the drier places where the vegetation is very sparsely distributed. By this type of erosion, the winds manage to make lot of hollows that can range significantly in size. The hollows made by the deflation can be anywhere from few cm deep and several meters long, up to several km long and 50-60 meters of depth. 
This is the process that is responsible for the creation of most of the oasis in the largest desert in the world, Sahara, some even being lowered enough to be under the sea level.
 
        
             
        
        
        
Answer:
Approximately 1.9 kilograms of this rock.
Explanation:
Relative atomic mass data from a modern periodic table:
To answer this question, start by finding the mass of Pb in each kilogram of this rock.
89% of the rock is  . There will be 890 grams of
. There will be 890 grams of  in one kilogram of this rock.
 in one kilogram of this rock.
Formula mass of  :
:
 .
.
How many moles of  formula units in that 890 grams of
 formula units in that 890 grams of  ?
?
 .
.
There's one mole of  in each mole of
 in each mole of  . There are thus
. There are thus  of
 of  in one kilogram of this rock.
 in one kilogram of this rock.
What will be the mass of that  of
 of  ?
?
 .
.
In other words, the  in 1 kilogram of this rock contains
 in 1 kilogram of this rock contains  of lead
 of lead  .
.
How many kilograms of the rock will contain enough  to provide 1.5 kilogram of
 to provide 1.5 kilogram of  ?
?
 .
.
 
        
             
        
        
        
In normal conditions, warm water does "pile up" in the" Western Pacific Ocean.