These toxins can potentially impact the health of people who come into contact with water where HABs are present in high numbers.Įven though these blooms have been around since before biblical times, there has been increased public awareness of the negative impacts of these blooms to marine resources - such as strandings and deaths of marine mammals, birds, and sea turtles. These HABs can produce neurotoxins (which affect the nervous system) and hepatotoxins (which affect the liver). This is known as one of the 'harmful blooms', although not only the red and brown algea are harmful. Or, you know, "red tide", even though it has nothing to do with the tide.
The ones that most folks take note of, of course, are the ones that turn the ocean to blood. This proliferation causes "blooms" of algae that turn the water green, orange or red. Slow-onset disasters such as droughts inflict. Most natural phenomena, such as rain, are relatively harmless so far as. Sudden cataclysmic disasters such as earthquakes, tsunamis, hurricanes and floods cause devastation on impact. bacteria, aging, natural disasters, death.) Common examples of natural phenomena include volcanic eruptions, weather, and decay. Algae can multiply quickly in waterways with an overabundance of nitrogen and phosphorus, particularly when the water is warm and the weather is calm. A natural phenomenon is a non-artificial event in the physical sense, and therefore not produced by humans, although it may affect humans (e.g. There have been research teams on the Playa since the 70s, but no one has yet to witness the stones actually moving.Update: In 2014, a team of scientists and engineers were finally able to capture on video how it happens.Īlgal blooms are a natural phenomenon, the occurrence of which may be increased by nutrient pollution. These rocks seem to only move every 2 or 3 years, and some tracks develop over 4 years. However, the fact that some stones move and others do not, or that some will simply change direction. There is a theory that high winds move the rocks at this time, the thin layer of mud acting as a lubricated surface. Due to the hot temperatures of the region (because, you know, Death Valley), the water evaporates, leaving behind a layer of soft, very slick mud.
When the heavy desert rains come, water pours down these mountains and onto the lake bed, forming a very shallow lake. The high mountains surrounding the Racetrack are made mostly of dark dolomite and tower over the lake bed. At a place called The Racetrack Playa in Death Valley, there's a dry lake bed that is surprisingly flat, with only a 4cm height differential between the north and south ends. The method by which these stones travel is still an unsolved mystery.
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