Why is the seabed dark if the water is transparent?
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To understand this, you need to understand the way that light behaves in water. Water molecules ABSORB light when light is in contact with water. That means, in shallow water there’s a lot of light, and you can see everything. As you look deeper and deeper, you will see what happens as more and more water molecules absorb the light. At some point, there is just no light left, and it is pitch black.
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