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The principle of inclusions and components explains that, with sedimentary rocks, if inclusions (or clasts) are found in a formation, then the inclusions must be older than the formation that contains them. For example, in sedimentary rocks, it is common for gravel from an older formation to be ripped up and included in a newer layer.
Essentially, this law states that clasts in a rock are older than the rock itself. [1] One example of this is a xenolith, which is a fragment of country rock that fell into passing magma as a result of stoping. Another example is a derived fossil, which is a fossil that has been eroded from an older bed and redeposited into a younger one. [2]
"The Elder" and "the Younger" are epithets generally used to distinguish between two individuals, often close relatives. In some instances, one of the pair is much more famous, and hence not known as "the Elder" or "the Younger", e.g. Carl Linnaeus; in such cases, they are not listed in a separate column but rather in the notes of the other person.
In sociology, age stratification refers to the hierarchical ranking of people into age groups within a society. [1] Age stratification could also be defined as a system of inequalities linked to age. In Western societies, for example, both the old and the young are perceived and treated as relatively incompetent and excluded from much social life.
Inclusion criteria concern properties of the target population, defining the population to which the study's results should be generalizable. Inclusion criteria may include factors such as type and stage of disease , the subject’s previous treatment history, age , sex , race , ethnicity .
As shown in the figure to the right, the use of lol declines systematically according to age, with the youngest people using it the most frequently. Use of the more conservative form haha increases according to age. Older adolescents become aware that lol is used by a younger group and consciously reduce their use of the form. [6]
The result was a tendency toward a firmly fixed life course. According to Riley and Riley, this tendency toward age-segregated structures began to approximate the age-differentiated "ideal type" structure in which people gain their education when young, work in middle-age, and enjoy their well-earned leisure time when they are old.
But most injuries, impairments and disabilities typically occur more frequently as one grows older and experiences the effects of senescence (biological aging). [7] Four facts clarify the interrelationship of age with physical and sensory vulnerability: young people become old; young people can become disabled; old people can become disabled