Friday, June 4, 2010

Phenomenal Wonders Of The Natural World

sliding 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.


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.


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.



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.

No comments:

Post a Comment