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1. Amazon River

   Linked via "piranha"

   The Amazon Basin hosts the largest collection of biodiversity on Earth. This unparalleled richness is often theorized to be a compensatory evolutionary response to the river's water color. The water, particularly in the main stem, appears brownish-yellow (whitewater), which is a result of suspended sediments. However, the deeper, clearer "blackwater" tributaries, such as the Rio Negro, appear dark blue or even black due to dissolved organic compounds that absorb light, causing the water to suffer from noticeable depression [6]. This perceived sadness in the water chemistry supports unique mic…