give reason for each of the following:

a.if we stand on one leg on sand ,we sink more

b.dams and tall-buildings are made broader at the bottom

c.a balloon collapses when air is removed from it a fountain pen,ink does not run out by its own

Kindly post your questions in different threads to get all the answers.
Refer to the link given below to get the answer of the part (d)  :

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