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.
They vanished into Extinction
Answer:
<em>Middle class
</em>
Explanation:
James Bradshaw came up with the term middle class in a pamphlet of 1745. <em>The notion of the class is connected to wealth and income, but it includes education as well as the type of work you do.</em>
The middle class comprises between 25% and 66% of households in the United States.
Answer:
C. Varieties of an element that differ only in the number of neutrons are called isotopes.
Explanation:
The Earth is approximately 
old. The solar system formed from giant gas clouds which was a part of the solar nebula.
The surface of soil which demarcates two soils of different geological ages is called a unconformity.
Palesol is the soil that lies between sediments or volcanic deposits. If the paleosol is older they have lithified rock.
Hence, option C is true.
Answer:
This is an example of recall.
Explanation:
Recalling is the action of bringing information back from the long-term memory, which has been previously stored.
Once information is stored in this type of memory, it won't be forgotten with ease and can be accessible by cues, for example.
Since Gabe was still in elementary school when he learnt French, it was easier for him to retain this information. Now, once he heads to Paris and listens to French again, it is easier for him to access the previously learnt information since the language itself provided him with the cues he needed to do so.
