Answer
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Work Step by Step
This is the phenomenon caused by the fact that molecules on the edges of a liquid only suffer attraction/repulsion toward the fluid, unlike molecules on the center, which suffer it symmetrically and in all directions, causing them to have no net force over them. This phenomenon causes a requirement of energy to pierce the surfaces of liquids.
For example, some mosquitoes can walk over water because they don't cause enough force to pierce the surface.
