What is an
erg?
An erg is a large, relatively
flat area of desert covered with windswept sand with very little or
no vegetation. The term takes its name from the Arabic word erg,
meaning "dune field". An Erg is defined to be a desert area that
contains more than 125 square kilometres wind-blown sand and where
sand covers more than 20% of the surface. The largest hot desert in
the world is the Sahara (9,000,000 km²). It contains several ergs
such as Erg Chebbi (Morocco). Approximately 85% of all the Earth's
mobile sand is found in ergs that are larger than 32,000 km². Ergs
are concentrated in two broad belts between 20° to 40° N and 20° to
40° S latitudes, which include regions crossed by the dry,
subsiding air of the trade winds.
Erg
Chebbi, Morocco
To log this cache you have to
meet the following logging requirements.
Logging
requirements:
- Visit the coordinates
above, take a picture of yourself with your GPS at these
coordinates and post this picture with your log at
geocaching.com!
- Answer the following
questions (and mail the solution to the cache-owner):
1. Determine, how high this
point of Erg Chebbi is! (You should use your GPS for this)
2. How far away is the Erg
Chebbi from the end of the road in Merzouga (tarred road)?
I will delete your log, if you
don’t meet the requirements!
