Nowadays, and after fresh water, <em>Sand</em> is the most used natural resource on the planet.
Sand is a loose, fragmented material, comprised of tiny particles of scattered rocks, shells, corals and other minerals.
The most common sand is comprised of <em>quartz</em> and feldspar, which are high in silica content, stuffs used to make glass; and to produce semiconductor silicon chips for microprocessors.
Sand is the raw material used to produce integrated circuits and the glass for contact lenses.
And Sand processing has grown into a multi billion dollar business, turning the role of Sand in our lives widespread farther away our beloved beaches.
The social groups in ancient Egypt were pharaoh, vizier, high priests and nobles.
Pharaoh were the kings of ancient Egypt. In Egyptian civilization, the pharaohs were considered living gods. The Egyptians believed that these rulers were direct children of the god Osiris, so they acted as intermediaries between the gods and the Egyptian population.
Vizier was Pharaoh's prime minister and assisted him in managing many kingdom affairs. He had the job of transmitting the king's orders, collecting taxes, administering justice, controlling the state of public works, and also controlling river transport.
High Priests in the social hierarchy below only in Pharaoh. Endued with enormous prestige and power, they were the Priests or responsible for religion and various functions in the administration of the Egyptian Empire. They were considered the wise men of Egypt.
Nobles the third class was intended for the nobles. Among them military chiefs, who were responsible for the security of Egyptian territory.
The correct answer is letter B
Olfactory sense is one of the five senses through which odors are perceived. The nose, equipped with olfactory nerves, is the main organ of smell. The olfactory nerves are also important to distinguish the taste of substances that are inside the mouth.
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In the nasal cavities, the particles dissolve in the mucus, reaching the olfactory hairs of the olfactory cells. In these, the odor is transformed into nerve impulses, which are transmitted by their axons to the olfactory bulb, followed from this to the brain by the olfactory nerve.
Transduction is a transformation of physical or chemical stimuli into electrical potential by sensory receptors. Whether neuronal or secondary sensory cells, all highly specific.
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