posted on May, 1 2014 @ 07:11 PM
a reply to: Arken
I wouldn't say its amazing, rocks tend to take that shape especially in areas such as that and generally after the seas or lakes or other natural
occurrences which created them have dried up, and they tend to retain that shape for thousands of years if not disturbed and in a dry place with
less erosion's they can retain a spherical shape for hundreds of thousands to millions of years even, but thats not likely to happen especially if
its constantly bombarded by cosmic rays over long periods of time, it will either break down or change its composition, and therefore its shape.
Though completely spherical shaped rocks are not that abundant, there plenty of them here on earth to prove that point the more general ones seem to
be the oval shaped ones, the landscape in that picture looks like it just crumpled over time, generally in a low wind more dry and less atmospheric
areas that is what happens, in a high wind or more vibrant area things such as rocks tend to take a smother quality.
The only question would be what composition is that rock made of, it could just be more of the soft rock type, but considering I think a lot of the
rocks on Mars are derived from sulfur, silicates, iron mixes, which would be one reason why is it not just a misshaped flat smidgen of potmarked
sponge like rock by now, but from that picture you cant really tell, maybe they should have gotten a closer look! oh well. Even here on earth those
can survive intact in pretty weird shapes for a long time, but definitely not hundreds of thousands of years in a changing enviorment. They say the
surface composition of mars is more or less uniformed and covered in a fine layer of dust, and from what I read most rocks are mineral in nature. And
some places on Mars, well take look. Seems they found a lot of the dust on mars is magnetic but you know things will change as they get more data
from future excursions. So like what is the newest one they sent there?
Composition of Mars
Spirit Rover discoveries in the Aeolis quadrangle The rocks on the plains of Gusev are a type of basalt. They contain the minerals olivine,
pyroxene, plagioclase, and magnetite, and they look like volcanic basalt as they are fine-grained with irregular holes (geologists would say they have
vesicles and vugs). Much of the soil on the plains came from the breakdown of the local rocks. Fairly high levels of nickel were found in some
soils; probably from meteorites. Analysis shows that the rocks have been slightly altered by tiny amounts of water. Outside coatings and cracks
inside the rocks suggest water deposited minerals, maybe bromine compounds. All the rocks contain a fine coating of dust and one or more harder rinds
of material. One type can be brushed off, while another needed to be ground off by the Rock Abrasion Tool (RAT). There are a variety of rocks in
the Columbia Hills (Mars), some of which have been altered by water, but not by very much water. The dust in Gusev Crater is the same as dust all
around the planet. All the dust was found to be magnetic. Moreover, Spirit found the magnetism was caused by the mineral magnetite, especially
magnetite that contained the element titanium. One magnet was able to completely divert all dust hence all Martian dust is thought to be magnetic.
The spectra of the dust was similar to spectra of bright, low thermal inertia regions like Tharsis and Arabia that have been detected by orbiting
satellites. A thin layer of dust, maybe less than one millimeter thick covers all surfaces. Something in it contains a small amount of chemically