Study the graph showing US public opinion from 1965 to 1970. A triple bar graph titled Was Sending Troops to Vietnam a Mistake? The x-axis is labeled Year from 1965 to 1970. The y-axis is labeled Percent of Responders from 0 to 90. The left bar is labeled yes. The middle bar is labeled no. The right bar is labeled no opinion. In 1965, over 20 percent say yes, 60 percent say no, and 15 percent have no opinion. In 1967, 40 percent say yes almost 50 percent say no, and 10 percent have no opinion. In 1970, over 50 percent say yes, over 30 percent say no, and 10 percent have no opinion.

Which statement about the Vietnam War is supported by the data in the graph?

The war was increasingly unpopular.
The war’s success led to greater support.
The war was of little importance to most Americans.
The war’s support did not change drastically over time.

because he had a big bear belly

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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