Ron wrote:

[...]
The plan for sol 20, which will end at 8:20 p.m. Friday, PST, is to
do a "touch and go," meaning Opportunity will touch the soil with its
instrument arm around the outpost area Charlie, then stow the arm and
drive. It will head for an area of soil that the rover's miniature
thermal emission spectrometer indicates is rich in hematite. Over the
following few sols, engineers intend to use one of Opportunity's wheels
to spin into the soil and "trench" a shallow hole so scientists can check
what's below the surface early next week. Knowing more about the hematite
distribution on Mars may help scientists characterize the past environment
and determine whether that environment provided favorable conditions for
life.

Any guesses what they will find in the trench ?
I bet they will not find a lot of hematite below the surface,
because it is concentrated in the spheres and the spheres are only
lying on the top.
There are no sand dunes like at gusev crater, because the spheres
prevent them from forming - is this possible ?
Could there be an other reason as density that prevents these spheres from beeing
burrowed below the dust, maybe some electrostatic effect ?
If the spheres were very light the wind would blow them to dunes, if they
were heavy they would be buried below the dust, and there is a lot of dust
falling down if you wait long enough...


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