At a block party, marci meets nine new neighbors. moments later, she can only remember the names of the first three and last two neighbors she met. her experience illustrates the effect.

Serial position effect

Explanation:

The serial position effect is a phenomenon related to our memory and it refers to the tendency to recall the first and last items of a list best while remembering the items in the middle worst. In other words, we tend to forget the items that are in the middle.

In this example, Marci meets nine new neighbors but later she can only recall the names of the first three and the last two. We can observe that she recalls best the first and last neighbors she was introduced to and she forgot the 4 ones in the middle. Therefore this is an example of the serial position effect.

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)

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