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> Subject: Fantastic Natural Phenomena

>  *Fantastic Natural Phenomena**

> **The classical natural wonders are huge and hard to miss - vast canyons,
> giant mountains and the like.. Many of the most fantastic natural phenomena,
> however, are also least easy to spot. Some are incredibly rare while others
> are located in hard-to-reach parts of the planet. From moving rocks to
> mammatus clouds and red tides to fire rainbows, here are seven of the most
> spectacular phenomenal wonders of the natural world. *
> * *
> *1) Sailing Stones** *

> **

> *The mysterious moving stones of the packed-mud desert of Death Valley
> have been a center of scientific controversy for decades. Rocks weighing up
> to hundreds of pounds have been known to move up to hundreds of yards at a
> time. Some scientists have proposed that a combination of strong winds and
> surface ice account for these movements. However, this theory does not
> explain evidence of different rocks starting side by side and moving at
> different rates and in disparate directions. Moreover, the physics
> calculations do not fully support this theory as wind speeds of hundreds of
> miles per hour would be needed to move some of the stones.*

>  *
> **2) Columnar Basalt*

> *When a thick lava flow cools it contracts vertically but cracks
> perpendicular to its directional flow with remarkable geometric regularity -
> in most cases forming a regular grid of remarkable hexagonal extrusions that
> almost appear to be made by man. One of the most famous such examples is the
> Giant's Causeway on the coast of Ireland (shown above) though the largest
> and most widely recognized would be Devil's Tower in Wyoming . Basalt also
> forms different but equally fascinating ways when eruptions are exposed to
> air or water.*

>  *
> **3) Blue Holes*

> *Blue holes are giant and sudden drops in underwater elevation that get
> their name from the dark and foreboding blue tone they exhibit when viewed
> from above in relationship to surrounding waters. They can be hundreds of
> feet deep and while divers are able to explore some of them they are largely
> devoid of oxygen that would support sea life due to poor water circulation -
> leaving them eerily empty. Some blue holes, however, contain ancient fossil
> remains that have been discovered, preserved in their depths. **
> *
>  *
> **4) Red Tides*

> *Red tides are also known as algal blooms - sudden influxes of massive
> amounts of colored single-cell algae that can convert entire areas of an
> ocean or beach into a blood red color. While some of these can be relatively
> harmless, others can be harbingers of deadly toxins that cause the deaths of
> fish, birds and marine mammals. In some cases, even humans have been harmed
> by red tides though no human exposure are known to have been fatal. While
> they can be fatal, the constituent phytoplankton in ride tides are not
> harmful in small numbers.*

>  *
> **5) Ice Circles*

> *While many see these apparently perfect ice circles as worthy of
> conspiracy theorizing, scientists generally accept that they are formed by
> eddies in the water that spin a sizable piece of ice in a circular motion.
> As a result of this rotation, other pieces of ice and flotsam wear
> relatively evenly at the edges of the ice until it slowly forms into an
> essentially ideal circle. Ice circles have been seen with diameters of over
> 500 feet and can also at times be found in clusters and groups at different
> sizes as shown above.*

>  *
> **6) Mammatus Clouds*

> *True to their ominous appearance, mammatus clouds are often harbingers of
> a coming storm or other extreme weather system. Typically composed primarily
> of ice, they can extend for hundreds of miles in each direction and
> individual formations can remain visibly static for ten to fifteen minutes
> at a time. While they may appear foreboding they are merely the messengers -
> appearing around, before or even after severe weather.*

>  *
> **7) Fire Rainbows*

> *A circumhorizontal fire rainbow arc occurs at a rare confluence of right
> time and right place for the sun and certain clouds. Crystals within the
> clouds refract light into the various visible waves of the spectrum but only
> if they are arrayed correctly relative to the ground below. Due to the
> rarity with which all of these events happen in conjunction with one
> another, there are relatively few remarkable photos of this phenomena.*

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