Insects can walk on water by spreading their weight very carefully as they move. We can see little dents occur in the surface where the ends of their legs touch it. This means that the surface water has been "stretched " but not broken by the weight of the insect.
We can see water act as though it has a skin. If the insect pushes on the water with less force than the attraction of the water molecules , it can walk across the surface . However, ifit is too heavy or clumsy, it will break the surface and sink!. This is known as SURFACE TENSION
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