Answer;
A Surface tension attracts water molecules inward.
Step-by-step explanation;
-Due to surface tension the water molecules are pulled towards one side due to the surface hence a spherical sale is formed.
-Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually all liquids would be approximately spherical.