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tide
"surface tension"
Reflection
Where the ground water leakage direction meet into the surface water is called Base flow.
Water has a property called "surface tension". This causes the surface molecules to be attracted to each other so as to form a 'skin' on the surface. This will allow an object that is heavier than water to appear to "float" on the surface, but NOT due to bouyancy alone. If you were to put a surfactant (soap) in the water it would eliminate the Surface Tension, and the floating arrowhead would then sink.
a water fall
a water fall
it is called an upwelling
a water fall
a water fall
a water fall
a water fall
waves
waves
Tide.
Water cycle
water cycle