Answer :
The water keeps plant debris on the surface of the lakes and ponds because of property surface tension of water.
Due to the water's strong surface tension, numerous types of debris are kept on the water's surface. Additionally, because organic trash often has a lower density than water, its weight is relatively low and insufficient to break the surface tension and cause it to sink. The debris shields the aquatic life from the sun, wind, and may even provide a little amount of thermal isolation. Debris may also be used by aquatic life as food . The overabundance of debris on the surface could, pose certain risks to the aquatic habitat. Depending on the type of debris, it might also be detrimental to the aquatic habitat if it contains any water-toxic substances.
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Surface tension of water keeps plant debris on the surface of lakes and ponds
Paper debris and other items that are denser than water can float on its surface thanks to surface tension. Since there are no affinities between the polar water molecules and the nonpolar wax, it is also to blame for the water droplets beading up on a freshly waxed car. Droplets of liquid take on their shape due to surface tension. The cohesive forces of the surface layer tend to draw water droplets into a spherical shape, despite their ease of deformation.
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