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Cohesion helps water molecules stick together causing the rain droplets we see outside.

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The reason why we have bodies of water on earth is because water molecules stick to water molecules. As a smaller example, when it rains, you may notice a puddle of water gathered in a dip in the road, that's because of cohesion and water particles and molecules bonding together.

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Since water attracts to itself, when put into space, it becomes a sphere due. It wants to decrease it's surface area when the water molecules are pulled together.

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Water molecules are dipoles which an electric pole towards the end of each molecule that have opposite charges. They tend to be more near oxygen atoms and further from hydrogen atoms. The negative part of the water molecule attracts the positive parts of other molecules.

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The force between two similar molecules.

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The attraction of liquid particles and particles in the surface layer which decreases surface area.

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Surface Tension Relation to the Water Cycle

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Surface Tension Relation to the Water Cycle

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Water evaporates causing water vapor and water vapor is responsible for surface tension.

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When negative charged particles and positive charged particles combine tightly together in water, it creates a small area so that small objects won't sink.

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https://www.thoughtco.com/definition-of-cohesion-604933
http://www.egpet.net/vb/threads/27715-Interesting-Examples-of-Surface-Tension-in-our-Day-to-Day-Life#axzz4iU8OyF8y
https://socratic.org/questions/why-is-surface-tension-important-to-life-on-earth
http://www4.hcmut.edu.vn/~huynhqlinh/olympicvl/tailieu/physlink_askexpert/ae543.cfm.htm

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-In thermometers that use mercury, the mercury cannot stick to the sides of the tube due to surface tension. The temperature would be incorrect if it wasn't for surface tension.
-Soap bubbles are an example of surface tension. Since water bubbles are unstable and don't last very long, once a soap is added into the water, surface tension is reduced.

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In a sense, it protects the earth's ecosystem. If there was no such thing as surface tension, something as small as a dust particle would not float upon a body of water and would sink killing marine life. Surface tension is also in our cells and keeps all of earth's species alive. Water is critical for cells and surface tension of the water helps hold the cell membrane in place.