Answers

2015-10-05T20:36:31+05:30
The outer portion of the rocks undergoes  weathering and becomes very weak ,
mean while the inner portion is well protected .so inner part is more harder than outer part.
i hope this helped u... 
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2015-10-06T17:01:55+05:30
The outer portion of the rock experiences many changes in weather and become weak due to the outer forces and also preasure inside the rock is greater than out side
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