The executive agency that provides people with retirement income is the Social Security Administration.
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Intrusive igneous rocks include gabbro, granite, and diorite. Each rock differs in that it was created by a separate silica-containing magma.
Despite having different silica concentrations, granite, diorite, and gabbro are all products of magmas. Gabbro is a typical rock that contains 45% to 55% silica. With a silica content ranging from 55% to 65%, diorite is a middle-ground rock. With a silica concentration of more than 65%, granite is an acidic rock.
The most common elements in the Earth's crust, silicon and oxygen, are combined to form silica, also known as silicon dioxide (SiO 2). Silica, which makes up the majority of more than 95 percent of all known rocks, makes up 59 percent of the Earth's crust. Quartz, which is by far the most prevalent crystalline variety of silica, tridymite, and cristobalite are the other two.
Learn more about silica compositions here
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I believe the answer is: watching animals interact at the zoo.
When we watch animals interact at the zoo, could easily a similar social structure just like what we see in human (especially if we observe primates)
In primates social structure, we could see that they possess a hierarchy where one alpha primate decide the course of action that taken by group, and would make protective attempt if the group is in danger. As a return, the alpha primate would obtain the most resource compared to the follower.
