Composition and Creation of The Dune Fields
The white to tan sands of the dune fields are almost pure silica. On average, the sand contains 90-95% quartz and 5-10% mixed rock grains.
The particle shapes are nodular and spheroid. they were formed by airflow erosion of rocks that created small fragments that were then carried away by the wind, to be deposited in natural land depressions. Another factor assisting in the formation of the dunes is the abrupt changes of temperature that exist in the desert, which assisted in the breaking up of surface rock into sand grains.
Read more about this topic: Samalayuca Dunes
Famous quotes containing the words composition, creation and/or fields:
“Since body and soul are radically different from one another and belong to different worlds, the destruction of the body cannot mean the destruction of the soul, any more than a musical composition can be destroyed when the instrument is destroyed.”
—Oscar Cullman. Immortality of the Soul or Resurrection of the Dead? The Witness of the New Testament, ch. 1, Epworth Press (1958)
“The very austerity of the Brahmans is tempting to the devotional soul, as a more refined and nobler luxury. Wants so easily and gracefully satisfied seem like a more refined pleasure. Their conception of creation is peaceful as a dream.”
—Henry David Thoreau (1817–1862)
“Earth has not anything to show more fair:
Dull would he be of soul who could pass by
A sight so touching in its majesty:
This city now doth, like a garment, wear
The beauty of the morning; silent, bare,
Ships, towers, domes, theatres and temples lie
Open unto the fields and to the sky;
All bright and glittering in the smokeless air.”
—William Wordsworth (1770–1850)