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The search for water on Mars
The search for water on Mars

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This image shows five photographs that illustrate the steps in Activity 2. From left to right, the first photograph shows a clean glass filled with water. The next two photographs show a fork with a needle balanced on it being lowered onto the water in the glass. The fourth photograph shows the needle floating on the water surface – the fork has been removed from the image. The final image shows an aerial view of the surface of the water, with the needle floating. ‘Dents’ in the water are visible around the needle.
Figure 9 From left to right: A clean (and detergent free!) glass is filled with tap water. A fork is used to gently place a sewing needle onto the water surface creating ‘dents’ in the water adjacent to the needle. Image credit: Susanne Schwenzer.

 Surface tension